Why not get rid of the Vet 5 system all together? Vet 5 is just a broken mechanic just like vCOH Wehr was able to purchase Vet 3 on all units.
Because its special snowflake neat. Relic should have two abilty unlocks (some already have a few) and again the combat utility shouldnt be better then other factions when they reach vet. Especially when you consider the already advantaged state these units start with in terms of firepower (Falls/Obers/Pfuse with G43s).
It's starting to feel less like people want balance, and more for OKW just to be ironed down into Ostheer 2.0
Factions can be unique with out being OP/UP. The Vet system is a problem for Volks because they vet up to fast, but for other OKW units it takes ages to vet up due to the fact your almost ALWAYS shooting at lower cost units.
The Sturmtiger/Stuka are probably the hardest to vet units in this game, simply because of what they shoot at.