Experienced this for the first time tonight on my first Ifrit fight. Indeed, it really sucks when players leave in the middle of a dungeon or trial. At first the healer left, so we trudged on with limited healing capabilities and potions with 3 players. Then the other person who had some healing abilities left, leaving the tank and me the DD to fight alone.

There should certainly be some kind of consequences for purposely leaving the middle of a trial or dungeon. Accidents happen. Maybe a power outage, etc. But in general, there should be some punishment for leaving your party stranded in the dungeon. Seems to happen a lot.

Perhaps banning them from partaking in a dungeon/trial for a few hours? If they continue to abandon parties, maybe putting them on a lower priority for duty finder, etc.