Yes and it works both ways.
It isnt. There is risk but you can still play and perform pretty well. And decrease risk by changing position and trying to be less predictable for pilots.
You should know that tanks dont render at all from few kilometers. While spaa can see you all the way from 10 km thanks to their radar (and you wont get rwr ping because no rwr). And send missile from 5 km. Or even 8 km if roland shows up. And from that point you cant really do much because you either guide bullpups and die or dodge missiles for rest of battle and also die sooner or later. Mclos cant do much against saclos and ir.
Okay, I see 100 sp on xm800t, I determined that its 9.7 battle and I can face ir missiles and roland. In a subsonic jet without ccip/ccrp/rwr/flares and 3 mclos missiles.
If 2s38 player focuses on aa job they will always hear, see, give t-6-1 marker long before you will see them and even while you are flying behind cover.
You can always hide and go into positions which are unlikely to be looked at by planes.
What if I enjoy certain air vehicle in grb? Or it isnt allowed to enjoy because its air?
Vast majority of planes isnt immortal and can be dealth with.
Mbts are much more common. And almost every ifv / light tank has tracking and lead indicator. Strafing them especially without gun ccip and with 23/13 mm pen at 500/1000m range might be bad idea. Same about spaa, gl strafing 2s6, gepard a2, sidam mistral or shilka m4.
Almost every single spaa with autocannon (or missile with some tnt) can engage ground and will be better at that than colt. 2a38m, oerlikon 35, lav ad gun, hydra pod, otomatic gun and other things are much better at killing ground than colts or sometimes even ifvs autocannons. I have never seen f5c (or even conventional tank) getting 10-12 kills in around a minute after spawning (which is case for 35mm spaa).
Pool of free spaa does not include more advanced spaa systems like iris t, mamba, claws, sky sabre, hq11 etc. So you still have to grind them. And some stock spaa are much worse than their spaded version. Stingers without prox fuse are just joke. Stock missile on asrad has 7 km range so strike drones have some window to send their missiles. Lav ad gets no hydra pod and worse belt. Gepard a2 gets worse belt and no apds, lvkv9040 gets no prox fuse round. Otomatic gets no sabot shots. They just lose their key features.