Late game scaling is an issue for all mg's. and only the most open of maps would allow you to exploit the smaller suppression aoe. And to be honest the mg42 at the moment is only good at suppresing one squad because of its very slow gun traverse.
mg42 scaling with vet is fucking amazing. It's literally the best scaling unit wehrmacht has, a single vet3 one is better than two vet0 ones. Maxim vet scaling on the other hand...doesn't really exist, you won't notice when you lose your vet crew to a riflenade. And while you're right about the traverse (on non-vet2 MG42s, anyway), you try stopping a blob of 4 units together with a maxim and come tell us how that goes. An MG42 in the same situation instasuppresses all the squads when it starts firing.
I know of at least 2 examples (don't remember nicks) and there was this Jelly guy who said himself he went from 2000 rank into <100 just utilizing Maxim spam.
So you don't know. And jelly is barely even in the top-200. A rank range to which pretty much every single player who plays a lot of games will end up getting into because the player base isn't that large.
Maybe the very elite 50 players don't have problems with it or maybe this is because it is very unlikely to see spam of a single unit in these super pro games.
If anything the high end game tactics are more stale than in midrank games and you're more or less guaranteed to see whichever unit is the most effective being spammed. And what can we conclude about what the high level players think about the viability of maxim spam (in 1vs1) from this?
The solution is simple. Make so supports weapons can't cap territory. Maxim performance won't be affected at all so if you want to spam them - be my guest.
To be honest this would barely make a difference ingame except by making mg42s even less enticing against soviets, and the "omg maxim op" crowd would be back to crying that it wasn't a big enough nerf 5 seconds after the patch notes hit.