Quit your emoutional exagerations, and learn facts. German army was equiped with old, underperforming models in 1944-1945. That, is just plain fact. The amount of new stuff laged behind US and USSR both quantitatively, and as a % of force. (The rubbish-awsome&perfect gap is just your own emotion)
Your argument that German production was flexible and quickly and efficiently switched to new, better models simply doesn`t hold any truth.
The debade went well, until my arguments were proven wrong, at which point, the debate was ruined.
Your argument how US and USSR had little models, and how putting the tech to 1943 forces Germany into ahistorical buildup is just plain wrong, since, well, Germany was the onle prodicing the least of new models, prefering to upgrade old ones. You still haven`t managed to ellaborate on it.
Your idea is not based on reality, sadly.
Except I said that Germany might be the inspiration for such an upgrade, anyone can go flexible or streamlined that is way I`m talking about those two as features.
Flexible is not exclusive to Germany and streamlined to everyone else, everyone can pick which one they want.
Why would Germany be the inspiration ? Maybe because they went through 3 chassis that were used as their main tank - Panzer III, Panzer IV and Panther while USA stuck with Sherman and SU with T-34.
USSR:
T-34 was produced in more than 57.000 units
SU-76 was the second most vehicle with more than 12.000 built but it`s a SPG
USA:
M4 Sherman was produced in more than 48.000 exemplars.
M3 was the second most produced vehicle with almost 14.000 exemplars but M3 is a light tank.
Germany:
Most produced unit was the StuG III with more than 10.000 - SPG
Panzer III was produced in around 5.000 units - production peaked in 1942 with more than 2.500 built, less than 500 in 1943
Panzer IV was produced in around 8.200 units - production of over 3.000 in 1943 and over 3.100 in 1944.
Panzer V - Panter was manufactured in more than 6.100 units. - over 1.800 in 1943 and more than 3.700 in 1944 other taking Panzer IV in total numbers produced in 1944 thus confirming the switch.
Germany made the transition from Panzer III to Panzer IV to Panzer V - Panter, USA AND USSR stayed with T-34 and USA with M4.
USSR`s and USA`s main battle tanks were T-34 and M4, those two didn`t deviate from the model they entered the war with.
Germany deviated having 3 different main tanks.
Panzer III the most produced in 1940, 1941 and 1942.
Panzer IV the most produced in 1943.
Panzer V - Panter the most produced in 1944
But this is still off topic, I`m just discussion a feature that is in game and how to better use it, a feature that is NOT exclusive to any faction.
Streamline and Flexible, I want to know how penalty to change production. Oh, In DD5 " If you change to a modified version of the same equipment (for example, the same tank but with a larger gun) you keep most of your Efficiency. If you switch to another variant of the same chassis (e.g. you switch from Pz IIIs to StuG IIIs) you keep half your Efficiency. And if you switch within the same family (e.g. Basic Medium Tank to Improved Medium Tank) you keep a small part of your Efficiency.", so from PzIII to PzIV will be one forth of the production, I think so.
Then some production lines will be PzIII without change and other production lines will be PzIV by change. That rate will be key point.
If I understand you correctly you want to know the efficiency loss ?
For example to modify the same tank T-34 to make it better you lose 25%.
You build a variant of vehicle based on the same chassis that was used earlier - switching from Panzer III to StuG III - you lose 50%.
You switch to a different chassis but within the same family - Panzer III - Panzer IV you lose 75%.
As it is in game with flexible you lose only 50% thus you halve all those so they become 12.5% , 25% and 37.5%
With streamlined you get a 25% boost to recovery rate thus you recover efficiency 25% faster.
As it is flexible is superior because you have to recover 50% less even if you do it 25% slower compared to streamlined.