I have to disagree somewhat. Axis have plenty of lights, its just vs su you wont face timely lights making the puma usefull. Usf and ukf dont have that isseu as much.
by variety of adversity I mean that Axis has one stock light tank (Luchs), two halftracks(251, flak 251), two scout cars (puma and 222). Not a lot of armor here and all that come waaay before SU-76 and could be long dead before its arrival, especially flak HT, due to its static nature.
So we have rather low armor pool of light opposition and rather late timing. If you consider 60 range and decent penetration stats we can see very clear intent to make at least somewhat viable at fighting medium armor, while Puma is purely anti-light with high speed and acceleration, defensive smoke and 'aimed shot', making it the best light vehicle hunter.
Since it supposed to fight medium tanks, it's clearly lacking here and needs better scaling, because current veterancy is pretty crap, in my opinion, and does not help with fighting P4s and whatnot at all.
Not saying it should have huge penetration from a get-go, but at least give it some at vet2 or even vet3.