How to deal with non contributing players

[RiyahArp]

My only idea why you would say that is

The OP's example read a lot more like a speed runner versus an explorer/weapon leveler. Not someone idling 100%. Because if your 99/99, you tend to run to the exit, and you don't need 4 people killing mobs in 21-30. The titan thing, yeah thats not good but he is down often in a minute.

Honestly the simplest solution is to just integrate some generalized anti-carry/anti-leech mechanic

these don't work. Like beyond a point, you cannot make an anti leech thing. Player will rubberband a controller to go in circles to prevent an idling. You have to empower the player to deal with them, vote kicking does that. reporting is there for times vote kicking cant work or help, or for much more heinous stuff. it's sad but you cant fix people that way, and you can actually make something worse by doing it.