Where I do agree is a possible suspension or extension of the timer if you have to replace a party member. I had a dungeon (Hakke Manor I think it was) that we finished without having a healer. Healer dropped, for whatever reason (maybe DC?) before the first mini-boss, and we NEVER got a replacement. I was cc'ing the trash with sleep, me and an archer were nuking things down as fast as we could, while the tank pop'ed tons of potions... and died... a lot. But we made it through... honestly the bosses were easier to survive with no heals than the trash were. The only one we had major issue was the last boss, but we got through, and just in time too! (I think there was like 10 minutes left). If we stood around for a healer, we would have never found one, and ran out of time.