Interesting wish. I know Hitech was looking comparisons between War Thunder and AH, and this could be a minor one with some impact.
In WT, you earn points to gggrrriiinndd your way up the painfully long "tech tree". It sucks, I hate it, but it is addicting (like any other mmo) to try and fill those progress bars up.
On the plus side, you earn those experience points from doing just about anything. Damaging or killing enemy aircraft, tanks, AI aircraft and tanks, completing the mission 'objectives' like bombing factories and airfields, or capturing a 'point' on the map.
I think with AH's current perk system, an 'incremental gain of perks for dealing damage, having a few troops reach the map room contributing to a capture, or other such things would be mostly unnecessary. However, it adds that instant gratification feel for contributing and might just make a small positive difference in the overall feel of the perk system.