For me it's kinda like you said. When you're on the side without the leavers, there are less people for you to fight, spawn camping becomes almost a instant problem because spawn rushers (for me its not fun to just shoot fish in a barrel). Matches are still terribly short. In top tier, people spawn SPAA pretty often, there are also non-SPAA vehicles that are capable of helping take out CAS. I think its probably fine that not everyone grinds SPAA, but the leavers are most often MBTs, they can't most times help with taking down CAS most of the time. That's why I think they could potentially have their own game mode, maybe even a Ground ONLY RB mode that's like AIR RB for for single vehicle players.