My humble and long contribution
Infantry
1) Amphibious Warfare Equipment, like the Paratrooper Warfare Equipment should give a bonus to soft attack, as they improved the resisitance of the equipment to the rigous of the salted sea
2) Mine-Clearing Equipment should have a medium tank prototype or similar as requisite, to represent the modifications made to some tanks on the to clean the fields like the picture used on the same tech.
3) Standardized Ammunition, Cargo Space have infantry supply reduced by 0.1 and all others 0.2, I understand that this must have be used to create some kind of balance, but infantry should have the biggest winner on this tech, cause the Army change was focused in the supply of the infantry, their jack-of-all-trades, not the way around.
4) "... Tube-Launched Rockets" all of the improve Hard attack of Militia, so the Army supplied Rockets to Militia but forgot the service rifles? I think that you can create a system that the militia should be one or two steps behind. So when you research improved SMG, the basic SMG, should be available to the militias and so on.
5) And the Basic Assault Rifle wasn't fitted to infantry too? And the Improved Assualt Rifle version was? The Army must be dumb!!!
6) The Basic Magnetic AT Mines increase the HA but the
improved Magnetic AT Mines increase the G.Defense, why? What is the logic, it should be applied on the same modifier.
7) The ENG brigades should have more bonus increase, the ART, AA and AT are considered improved during the game, but the ENG are relegated to a 2nd place.
Armoured
1) Why Basic Amphibious Tank have shore attck bonus to ARM and MEC, and the Improved/Advanced Amphibious Tank only to ARM. And the top-tech the Submersible Tank have bonus to both?
2) .30/.50 Cal AAMG wasn't fitted to MEC division too?
3) The Enginnering Tank (290mm Mortar) as in the discription, shouldn't be applied only to ENG brigades?
4) Due the "... Personnel Carriers" tech the MEC have 3 speed increase, and it doens't have a MOT counterpart, making MEC faster than MOT.
Electronics
1) It should be more integrated on Late-War vehicles, like MBT's, Advanced Planes and Ships, cause all of the must have a radio or other piece of electronic on them.
2) The Radar of the Night Fighter should be incorporated , as an option to Late-War Planes. Or it was dropped on Hoi Beta development?
Industrial
1) The Industrial Pasteurization should be applied to the Navy too, as them could store more and better food on the ships.
Nuclear
1) Should have some kind of offset to an atomic bombing, like raising the dissident.
Naval
1) A lot of tech has bonus to Shore Attack applied to Cavalry and is something out of reality an Amphibious Cavalry Landing!!! Horses coming from LCI's!!!
2) I don't know if it matters, but on some techs we have "+1. (U)" and others "+1 (U)" the point ? influence in something or the HoI engine takes as 1.0
3) And you have a lot of tech like on the Artillery Tree that should increase the Supply Consumption, like the Air Defense techs.
Artilley
1) Infantry Gun (70mm+) has CAV HA +1, it shouldn't be SA +1? And Why the CAV don't have the bonus of Infantry Gun (30mm+)?
Heavy Aircraft
1) You have a lot of tech like on the Artillery Tree that should increase the Supply Consumption, like the Turret Defense System, they ate Ammo!!!
Light Aircraft
1) If you research a Medium Range Fighter Engine, why the Multirole Fighter has shorter range than the Interceptor? And if they have also TAC Attack, they should escort Dive and Tac Bombers with their extended range.
Land Warfare
1) Why Great Patriotic Warfare is a AI only Tech? It should benefit the player as well, Germany doens't have SS techs. By the way this idea of "National Specific Techs" are GREAT!!!
Air Warfare
1) USA should have a "National Specific Techs" that improves somehow their Airforce.
Naval Warfare
1) Rework the Kamikaze Planes, they should be one time only, like the Rockets.
GREAT WORK by the C.O.R.E. Team