Ltn, Cpt and Mjr all eat population and need upkeep - Schwerer doesn't see. You see the difference?
Vehicle crew supposed to be feature for paper tanks.
Still, no reason for free Anti-Air.
Ltn, Cpt or Major don't prevent you from using commanders abilities. Schwerer HQ does.
to be fair Ltn, Cpt and Mjr all takes population yeah, but USF can get 100+ pop cap.
The reason for free AA for OKW: They are the special snowflake, since day 1
I always wondering why medic and repair truck needs an upgrade and the schwerer not. Seems like there was a reason, to not give them an upgrade at all.
Upgrade schwerer with AA = small fuel cost or munition cost imo and everyone is perfectly satisfied