OKW doesn't need any more area denial
It doesn't have any area denial outside of the Flak HQ. Compared to Ostheer which has bunkers and good MG's and minefields. Soviets have plentiful explosives to deny points and the maxim is finally a good MG.
As a reminder the Maxim (and of course .50) have tech costs which are not inconsiderable, while the MG34 has none. Until such time as I can build Maxims and .50's at 1 cp without tech the cost of the MG34 should remain.
In its current format the MG34 is fine, if you are willing to change the way the MG34 is built and the faction slightly we can talk about changes.
I want to reiterate for 210 mp in a faction that rarely lacks mp you can have a suppression platform at no tech cost, instantly, and salvage the gun if you lose the crew for fuel. It also comes with 5 possible levels of vet and a good vet one ability.
Except with veterancy it still can't take on any other MG in the game 1 on 1. Be it without vet or with veterancy. The reason why the popular suggestion is to raise the cost and buff it is that it wouldn't be spammable and it would actually do what it's supposed to do. In 4's it might be fine but in 1's and 2's it sucks that you can't rely on it at all. And it doesn't help 1 of the doctrines it's stuck in (Luftwaffe) is shit.