I dunno, it's more a player issue than something that devs should meddle...
A fast clear is awesome, but I don't mind if as a tank I gotta do smaller pulls.
Same way, it's nice when someone that says "first time" challenge themselves.
What we need is to get out of auto mode and remember that there are people at the otherside. Talk, challenge, laugh... If fails, move on.
Doing 50 times the same thing is insane, do it mindlessly is not human.
After I brought my nephew of 10 yo to play, I always wonder if the otherside is a child, a person with physical challege or hell, a person that had a bad day.
I would rather have a fast run. But if the opposite occurs, I take my time to devour the design of the dungeon, toss some cheesy jokes.