So, you mean having to score an insane amount of kills to reach the full potential that other units reach in 3 starts, because vet 5 now is basically overglorified vet 3. cit. Mr.Smith.
Getting to veterancy 5 is now around the same as getting veterancy 3 when comparing OKW units to everyone else. This means they get those extra veterancy bonuses earlier which have been adjusted to abilities and non-combat stat passives. Highly ranked OKW units also give less experience to the enemy as well, on-par with the others when maxed out.
Imo remove its kingness and make it more accessible, USF is already struggling to reach CPs since they don't build anything ,the unit is just going to be too late. (And it is going to be even worst in teamgame)
Then we have the issue of having the same M8 Greyhound that no one builds. 4CPs is also not that far away. In most cases if you're being aggressive with USF, you'll have those CPs when the majority of light tanks are arriving, if not slightly after.
Furthermore, the M8 can still tackle other lights the same way a T-70 can while also having 24/7 recon vision while the T-70 needs to pop the hatch open and shutdown its main gun.