How its always worked basically amounts to.
Fireteam is easily exploitable, and when doing certain team comps (along with skill and teamwork) can be overpowered
However most players either
A cant exploit fully because they are solo queueing
B dont know how to exploit
C simply dont exploit because they wanna have fun.
And very rarely do those who dont play the meta, or arent on a coordinated team, win against pred. Because without certain builds, it can be hard to solo pred. So individual skill means fuckall.
Thats why this debate never ends. Balance is balanced for 4 players dealing damage to pred to second wind typically. So pubs are almost always guranteed to lose. However during the 1 percent of actually fighting good, coordinated players, the tables turn pretty much entirely. People dont like feeling like the game is decided before it starts simply because the balance is ass. (Not saying wins cant happen either way. Just saying its rare for them to)