Filthy Lucre
Adventurer
I wouldn't let forum dwellers get you down. D&D is so popular now that I can't imagine it not being viable to literally interview players to determine if they're going to suit the game you want to run.So, it seems D&D 5e is the first game I know of where you have to negotiate with the players beforehand if they are allowed to lose. Maybe it's time to take the "G" out of RPG and everybody will be happy.
This really seems to be a non-issue you guys are going back and forth over.