nice strawman argument I never said that. And you forget SPAA can only shoot in one direction at a time, so if your are outnumbered by planes another plane will attack you from your dead angle and because every non-rocket SPAA has tracer rounds you are revealing your position to every aircraft in the sky.
Strawman no.2 never hear someone demands SPAA to be untouchable. And why do you think it’s 0 effort to use SPAA? Ever tryed to shoot down plane on BR7.0 with the SPAA Wiesel? Most WW2 SPAAs shoot rounds at ~ 800m/s and even modern SPAAs like the Gepard reaches ~1000 m/s you have to pre-aim pretty far most times and have luck that you predicted the movement right. Otherwise your shots will miss the target, but you revealed your position, what is very risky.
The other option would be to only shoot at very close traget, which would result in a lower impact in the match if not taking the mentioned risk. Moving closer to the capture points is no good idea as well, because of the other tanks who can take you out easily.
Are we still talking about a videogame? For me I say a PvP Game must be good balanced to ensure a fair competition. And right now CAS has an unfair advantage simply to the fact that most ground vehicles can’t defend themselves against them. And those vehicles who are supposed to protect them end up most times dying invain by trying to do that. The average time I am alive with a SPAA is around 30 seconds (record was only 7), because it draws so much attention the enemy CAS players.