Re: BFV back prone
The problem with the TTK-changes was that a lot of guns became useless and we got 'metas' with only some guns being viable and most of the guns being "useless".
Attrition just became 'a lot of work'. After each gun-fight you had to find healing and if no medic was around (and you weren't playing medic') you had to find a health-station at the nearest objective, otherwise you your next gun-fight would probably result in certain death (because you loose health at most gun-fights). Health-attrition slowed the game-play down too much.
Arty/rockets again was a matter of the game-play being slowed down, you could not PTFO because objectives were being spammed by rockets or arty, especially "late-game". This also often makes it very hard for a team being spawn-trapped, to capture any objectives and get back in the fight.