You could always heal yourself and teammates fast in BF, it's been like that since BF2, I am not sure about BF1942 or Vietnam anymore, but back then it was only "Medics" and now it's "Support" now you can heal and resupply and that leads to too many healing boxes all around the map. Back in the day you had to choose between unlimited ammo or being able to heal yourself and revive others. Now that one class can do all of it, it sort of ruined the balance.
They could try an experiment and add an official "Classic BF Experience Mode" that works basicly like back in BF2 or BF3 or something, without unlimited sprint, jumping and sliding costs stamina, Classes like in BF2 or BF3, suppression system harder again, no 3D spotting only minimap spotting, 6 man squads etc. they could see how it runs. If they can somehow change the classes just for a game mode somehow. I would play that mode, imagine you have to think before running, because you run out of stamina really fast. That means no more bunnyhopping and sliding players all around the map, it would make things slower again.