It was horrible idea in COH OF and it will be terrible idea here. What you are saying doesn't sound wrong in this example, but across the game in other instances it would wreck havoc.
For example, Having Unit and healing bunker would make that unit very powerful for example as opposed to unit that has to run back to HQ to heal, it would allow someone to exploit extra survivability to max with medic bunker, keeping constant pressure without losing any models. It would create further imbalances throughout the game.
I repeat again, it was terrible in OF COH
Can you please explain how a generalised LMG dmg, rather than it chewing one model to death at a time, is related to your post?
I dont get it. Please give a scenario in which what you talk above would happen against an LMG?
Furthermore, MG42 has a version of this proposed change by Cruzz already in effect.
Its DPS and suppression factor (iirc) is directly related to and scaled by how many models it is firing at.
So a precedent, of sorts, already exists.