It's not just 4v4 maps. There are too many lane maps in 2v2 and 3v3 as well. Just think Minsk, Rails, Kharkov etc.
I don't want to play against Maxim spam and there is a reason this obnoxious strat was nerfed hard in the past. It's not a very smart move to just forget about this and buff the Maxim back to its old levels.
In all seriousness, I don't think there's a way of "fixing" the Maxim. The Maxim will always be spammed in 2v2+ games (especially amongst lower levels), which I find interesting considering that more than 2 MG42s/Vickers are never seen. Maybe it's just to compensate for Conscripts' weak performance early game, but Grens suck too, yet Ostheer players never seem to go all out and make 3+ MG42s.