I understand your plight, but some people aren't there for the objective, and there for maybe kills required for a catalyst, for seasonal triumphs, or because they're toxic teammates.
Because its controll.
Not zone controll.
In controll...kills give points.
In zone controll..holding zones gives points...and kills dont give any points.
1. No incentive to win, therefore by default there's no incentive to play the objective.
2. Bounties/quest steps take priority.
3. Ain't nobody got time for dat.
You just answered your own question. They are also trying to avoid the crappy team balancing which isn't sbmm but a poor form of it. The moment I touched diamond in control all my games became sweaty and full of 6 stacks and its not like I wanted to I just play quick play for fun and happen to be on the winning team. The elo stuff is the silliest thing to exist it litteraly punishes people for winning so I don't blame them for farming while attempting to lower their elo.
Look on LFG, there are posts about this. People call it “Control KD Farm” They will get a group of 6 players, all 2.5+ KD and stat farm for hours. If you see a 6 stack when you are loading in, just leave the game. There is no point in trying to play that game, it’s a stat farm method for the top 10% to further the gap from the rest of the player base.
This is bungies fault.
Its so incredibly stupid not to have standard team death match in a shooter. There’s literally no defending such a dumb decision.