The problem is not that since vet 4/ vet 5 bonuses are more utility.
The problem is OKW vet 3 bonuses have not been adjusted (have simply been removed) and are currently lower than other faction.
VG's vet3 bonuses are lower than conscript's vet3 bonuses
Penal's vet 3 bonuses are higher than most OKW vet bonuses
and so on...
Generally speaking the whole vet system need an overhaul (actually it needed one 2 years ago before they started redesign factions):
XP values/speed need to be adjusted
Vet abilities need to become more useful/better designed to unit's role
Vet bonuses need to be adjusted and custom tailed for each unis role
