However it is silly to agrue that small countries ever had similar amount of modifications and division templates as larger ones.
Larger nations tended to have much more, despite haing far smaller percentage amount of their military fighing the war.
Large chunk of German army was sitting idle guarding Norway and France. Should Germany really gain less combat expirience fighting with hundreds of divisions in Russia but only having say 60% of it`s forces engaged, than say Slowakia that has 1 division, and has 100% of it`s forces engaged?
USSR historically only had a small fraction of it`s forces engaged in winter war, and yet, it gained significant expirience and certain designs were thrown away, while others uplifted(most famous probably KV-1 tank), while Finland having most of it`s forces engaged didn`t really manage to get ahead in terms of organisation, nor to develop great domestic modification to it`s equipment. It would feel very awkward to see the situation reversed in game.
IMO as people sugested, something like logarithmic dependency would be great, where nations like Germany and USSR would gain 2-3 times the amount of expirience small weak states like hungary will gain.
No, the intent is Germany would be getting less XP per division per hour than Slovakia, they'd still gain more in total because they have so many units in combat.