Hey @qpwoeiruty69 I don't know about the MG42 recoil as I rarely use the MMGs but wanted to quickly reply on the other two points.
The LMGs, like the Lewis and BAR, seem to work very well for me when it comes to TTK but I believe the MMGs are balanced this way due to the fire rate - after all if something fires at 1000rpm then the damage needs to be balanced accordingly. Similar to how you can't ADS unless using the bipod.
The last thing you mention sounds like the new end of round balancer which is being tested on official Breakthrough servers at the moment (here's a link to a post about it: https://forums.battlefield.com/en-us/discussion/205325/community-broadcast-new-eor-matchmaking/p1). It's not enabled on Community Games though so you might be able to avoid it that way.
