Actually they are fine since they got their reinforcement cost lowered. but scaling is not fine. reaching vet 5 with either of them needs an absurd amount of xp.
That is the price for absurdly good vet and passives.
Increased range, from 60% rec acc to 60% acc bonuses, passive healing, permasprint, suppression.
Every single infantry squad have something unique and amazing above vet3.
At vet3 they have similar bonuses as other vet3 infantry. Everything above that is a huge bonus.
You can't expect to get that kind of advantages quickly.