Yes, bring on the 30 min debuff and leave the first 5 min quitters in the dust. And don’t give them any chance for loot whatsoever if the group decides to continue.
Or give a 30 min debuff but still be able to join groups but the people that invite can see if you’re trustworthy or not and decide if they want you or not. Win-win.
M+ is a overtuned mess. If they’d introduce penalties the number of key runs would go down even more. If it stays as hardcore as it is I’ll leave as many keys as I want if it’s a waste of time. It’s just not fun in PUGs, especially as a heal this week.