Well, the thing I was replying to was specifically the idea that in that case, if the healer gets put into a ghost then it's an automatic wipe. Which isn't true. People can do stuff. If it's tuned so high that there's no room for error than perhaps not, but there's a fairly wide gap between that and "it's literally impossible to fail this" that we had in 4.0 expert. I think there's plenty of room to close up the gap without it being "someone missed a thing, wipe it". Especially with the ghosts, where in a dungeon context you'd really just need to be able to buy time for the healer to get back and then carry on.
Tuning is always harder with less people because of the wider variables involved, but that's not really justification to say "everything has to be faceroll", which is what I was getting from Riyah.