As I am revamping the land doctrine trees, I am totally against the notion of players deciding the doctrine route that they are to use.
Do you undestand the complete and absolute ramifications a military will face by changing its historic doctrine mid-stream? I don't think that you do, as Italy actually TRIED this, and failed HORRIBLY in WW2.
The War of Rapid Decision, Italy's response to Franco-German doctrines of the time (Methodical Battle and Operation Level), was a theoretical combination of both doctrines, which in theory would work extremely well against either opponents.
However, theory is one thing, practise is another. Most Italian generals were against this new theory, which was one of mechanization and modernization. When speaking of tanks, a General admitted to their value, but, stated that for Italy, the most valuable asset is manpower.
Military commanders were entrenched in their theories, so too was the pre-era of training. Italy's armed forces had remained in-tact post-Great War, and thereby had a continual line of power in the nation. Their military thinking was linear, being a progression from experiences and developments from those experiences. Germany lost everything post-Great War, thereby could start from scratch, and had many lessons to learn. It is easy for a nation like Germany to create and correctly implement such a doctrine, when their military was really lacking a post-war doctrine. Italy had baggage in 1936, Germany didn't, it is easy to say "I as a player want Italy to fight just like Germany", but not in CORE2, as we try to keep a semblence of reality.
The military was designed, up to 1936, to fight a war against Yugoslavia, France, or other southern European nations.
This after Italy changed doctrines to semi-represent Germany's armour and motorized heavy doctrine. Imagine the disaster should Italy have tried to copy it exactly! Frankly, Italian ability in WW2 would have been much greater had their doctrines been reinforced to fight a war that their military had been preparing for ever since 1919. Changing focus in 1938, so close to the next war, left Italy in chaos.
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In future CORE2 doctrines, you will face a much greater degree of choice, where no doctrine is totally overbearing in every aspect for a period of time (say like Operational Level is initially in the game).
What I did, was to streamline each doctrine to initially be exactly the same from one another. Each has similar choices (to mechanize, to not mechanize, to focus on offense or defense, etc.). However, unlike in Vanilla, CORE2 doctrines will add bonus' not just to entire land units, but, actually increase stats for specific land units, and even decrease for others.
Italy and Japan share the same doctrine (War of Rapid Decision), since their general doctrine supported a shorter war of a decisive battle concluding the conflict. However, both historically went different ways. Japan took a non-mechanized, more offensive aspect of warfare, while Italy took a mechanized, more defensive aspect of warfare.
In the future CORE2 doctrine, paths such as mechanization will give bonus' to specific unit types (anything large armoured and fast), but, also take away from other areas (faster units get more focus, thereby slower units aren't quite as capable). As Italy, if you choose the mechanized role, your motorized military will be very capable, but, since most of the military are unmotorized forces, you will actually be handicapping the bulk of your troops. The same thing will be done for Germany's doctrine, as taking the mechanized route, your motorized forces will be strong, but a handicap for your unmotorized forces (this is felt less due to Germany's better NCO and lower officer class). So, even if you do give Italy, Germany's doctrine, you still will face the same problems, as the bulk of your troops organization and morale will actually be lower than if you take the non-mechanized route.
Attachments will have organization increases. For example, if you choose non-mechanized tech, armoured battalions get organization increases (as the potential of the tank was recognized by all, but, the impression on how it should be used is different), along with artillery. This way, you are encouraged to develop a specific range of attachments as well as divisions that may suit your doctrine development. As Italy, it will be expensive and difficult to field a modern mechanized army, like Germany, but, it is possible.
Realistically, Italy did develop a good doctrine, very capable of dealing with German and French opposing doctrines. However, it lacked the industrial ability to develop its military to have enough of the equipment required for this doctrine. Combat in North Africa required the rest of the military to have virtually all of its motorized equipment stripped to replace losses (most Celere divisions lost their motorized artillery for example).
So, it isn't that Italy is given a bad doctrine (rather, it won't be), but that it was unable to meet the strengths of the doctrines due to other constraints.