This is not what I meant. I meant that all tech is equal for every country. Not that every country starts with the same tech, but that 1936 fighter is the same as another nations 1936 fighter, and has been for every HOI game. At least in HOI IV variants should switch it up quite a bit.
But there is no such thing as a "1936 fighter". Instead there will be:
1936 fighter Reliability=0 Weapons=1 Range=3 Engine=2
With another country having:
1936 fighter Reliability=1 Weapons=1 Range=1 Engine=2
The combination of variables will give different air speed, manoeuvrability, air attack and defence. A different plane, not the same plane with a different flavour name.