On the downside, the smaller caliber meant a smaller filling of High Explosive (over all a tank spent much more time fighting soft targets than hard) compared to the 88 or similar Allied guns, it was unreliable mostly due to poor final drives, and the side armour was so thin it did not stop AT rifles. The Panther was great at shooting enemy tanks in front of it, but over all it wasn't a very useful tank.
I once read an amusing quote about the Panther's effect on post war design: "a Main Battle Tank is a tank which has the armour and firepower of a heavy, combined with the speed and versatility of a medium. The Panther had the armour and firepower of a medium with the speed and versatility of a heavy"
The quote you are quoting is an opinion from a guy who writes books about Panthers. It doesn't make it a fact. Of course, my opinion isn't fact either. Do note I didn't say it was "useless" though, it was pretty good at shooting tanks, it was just not too useful at the other important roles a tank had to fulfill. Rather than quoting a lot of facts and figures, I'll just link to another guy's
reflections on the Panther, and the
French impressions of the Panthers they had after the war ended, both are pretty interesting reads if you have time.
(WoT is a cool game both for shooting tanks and for bringing tankophiles out into the light)
I do not know where did you get all that but:
Panther`s mobility was perfectly enough, in fact it was faster than Pz4, and M4, and had similar power to weight ratio.
Panther`s firepower was perfectly enough against soft targets.
Panther`s side armor was still better then PZ4s side armor.
Panther had more munition in storage.
Panther was only slightly more expensive then Pz4.
I can`t see you point about "not very useful tank".
Somehow, Germans, despite being so clever and efficient, allowed themselves to be in situation to produce 2 different chassis (PZ III and PZ IV) despite both being in same weight class and actually very similar jet not compatible at most(they used same Mybach engine though and even tried early on some standardisation of parts which shows they sough problem ??). So they had 2 diferent production lines for vehicles basically in same class. Great problem, as once PZ III encountered T 34, being unable to penetrate it with its 50 mm gun and not being able to mount larger 75 gun Germans lost many time and resources to counter treat , they ceased PZ III 50 mm production and changed all to STUG with PZ III chassey which was not substitute for tank in offensive role that Germans needed in first half of the war. Standard PZ IV chassy could enable massive quick rearming of all German panzers with killer high velocity 75 mm gun.
The things are even more interesting because PZ III production gearing in pre-war period had tremendous problems. PZ III suspension system was changed many times in preproduction until 1939, and nobody in Germany actually noticed that best will be to use similar PZ IV chassy which had no such problems . Its possible it was because of kapitalistic separate interests, because "Krupp "had PZ IV chassy while "Daimler Benz" pushed their PZ III chassy?. In fact by late 1938 there was no established production lines and tools for mass PZ III chassy production at all, only manufacture of prototypes of which one by one were not satissfactory because of suspension system faliures.There will be no re-tooling of PZ III production lines in 1938 because there was no any. They simply could have decided for tooling and establishing PZ IV chassy production in all factories ,put it on 50 mm AT gun like in PZ III (they could even call it PZ III for distinction ) , and have other version- PZ IV as in RL with short barel 75 mm gun for infantry support. By the time of attack on Poland there was no actual serrial production of PZ III , 98 PZ III overall of which half prototypes with technical problems, while there was almost 300 PZ IV-s with much smoother production gearing up.
Well, Germany`s war industry was notoriously corrupt. That said, we do know that it was corrupt because we got asses to every last document, and numerous people wanted to look there and write books about how bad was the regime. Something there was, and still is very little will to do among allied nations, because, you know there are pelnto of people that want silence about every wrong thing that happened in allied nation during the war.
Arguably, one of the reasons for French so fast collapse and Soviet massive loses in 1941, was massive corruption that led to troops being unprepared, but you will never hear about it.
Tooling entire tank industry of Germany to produce only PZ IV chassy, which was ready in 1938, will enable mass production and standardization as well as flexibility of German tank units. The 75 mm high velocity gun could be mounded easily if required(as required in real history) on all tanks since PZ IV concept had better upgrade potential. Germans surely had no clue they will need long barell 75 mm gun one day, but industrial logic is to make standardised tank if both are so simillar.
By some estimates if Germans decided in early 1938 to use only PZ IV chassy as standard one for all tanks in production distributed all over the Germany , they will at the time of attack on Poland have at least tanks for 1 panzer division more. By the time of attack on France at least 2 panzer divisions more, and for attack on USSR enough tanks for 4 Panzer divisions more, not counting all of them be able to be upguned more easily with powerful high velocity 75 mm gun once needed(if needed because probably USSR will collapse). In 1943 alone, if USSR will survive, historically geared German industry could produce minimum 5000 standard PZ IV 75mm long barel alone in that year .Counting long barel PZ IV to T-34 kill ratio of 3:1 this will seal the destiny of USSR. Even if that fails, standard production od PZ IV chassy troughout Germany will enable bettter compensation of destroyed factories in later Allied bombing even a scavenging of parts. For instance destruction of Alkett factory in allied bombing stopped for months delivery of all vehicles based on PZ III chassey.So this will make tank production more immune to allied bombing and prolong the war.
I wander will HOI IV have a features that could adress such important factors of tank production ?
It would be great if we could mend that problem, but it could become overpowering Germany.
Actually, the early Pz IV's were infantry tanks and not main battle tanks used in the Panzer Divisions. It wasn't until the Pz IV F2 replaced the Pz III J in 1942 that the Pz IV's became main tanks (and the Pz III N then took on the infantry tank role.)
There was little difference actually. Pz4 was perfectly capable of being main tank, it is not some sort of Matilda or Churchill.
There was nothing high-tech about Pz4 F2, it should be contemporary to T-34 of 1940,
at most.