Note, regarding my checklist on the first page, nothing is saying you can't have good numbers on top of all that. It isn't as selfish to consciously play slightly sub-optimally as it is to demand others strain themselves and sacrifice their enjoyment of the game so you can go back to...running around the Aetheryte in Idyllshire? Flirting with Rowena's girls? Swooning over adorable Gobbies?
Like, I can get being annoyed if someone sits there and just autoattacks, and never uses a cooldown, and sits at 50% the damage they could be doing at their iLvl, but if they're at least trying somewhat and stuff is dying and they aren't standing in stuff? I'm fine with my runs taking an extra 10 minutes if it means nobody feels incompetent. DF is content I enjoy, so I honestly don't mind if it lasts a little longer.
Besides, what's really so important that you can't spare an extra 5-10 minutes?