So let's be real here. Trash mobs are just that, trash. They only provide a challenge if your healer is too engrossed in their Netflix to toss you a heal, and then really only if you wall to wall pull.

So what's the point? You know other than contention between players that want to pull everything to get to the bosses asap and those that just want to do a pack at a time? I think we can agree that party strife is not a good thing, so I propose a solution:

Cutscenes. Yep, you heard me right, cutscenes. That's the place the trash mobs should only exist, in a brief cutscene showing their demise at the players hands and introducing the boss that the party then gets to fight. Rinse and repeat 'till dungeon end.

This will end strife between those that want to rush and not by removing any need for such in the first place as well as cut down dungeon design to just some cinematic renders and boss room layouts potentially allowing for more to be added to the game for the same amount of time.