A person defending a base in a manned gun isn't avoiding combat, they are engaged in combat if they are firing at attacking enemy planes. Ask Vilkas if he was avoiding combat by being a flak gunner during the war.
It would be different if they were actually doing that. But they're not. I'm usually engaged in combat and some griefer is taking pot shots at me while I am. When I'm not engaged in combat, I'm simply waiting for someone to engage. I have zero interest in playing chicken with some guy in a fixed gun who's only goal in life is to ruin my fun.
And the MA isn't war. It's a game. If you want war, scenarios and FSO are where you should be.
It's pretty simple. If everyone sat in field guns there would be nothing to defend against. As you play ask yourself, "If everyone did this all the time, would the game be any fun?" If your answer is consistently "No" then you should probably change your ways or there will be no game. I have no issues against the 37s because I can fight away from the base without being harassed. I'm here for
air combat against other players. An 88 is
not air combat in my opinion and detrimental to play. Leave the ground game on the ground.