"If you liked it then you shoulda put Asylum on it" doesn't do the situation justice. Imagine a fresh 60 with decent gear after a day of Sohm Al getting Bael for the first time with a tri-pack rush tank at the start - there's a lot of variables for Healers to account for. Probably the first time in 10's of levels where the Healer will actually be challenged in the decision making department (would love to see some of their faces when the aether hits the mill). I've healed Bael-Fail many times but even I'm wary when I see tanks making a mad-dash for the first tri-pack as I know we're all going to be dotted before tank stops and at that point I've had absolutely NO way to guage just how tanky they are and how stingy they are with their mitigation CD's, and both Healer + Squishy HP bars can end up in ping-pong mode if the stacks get out of control (HP whittles down by default no matter how many Esuna's - eventually you need to cure as well - and not all tanks have steadily declining health when three packs are chewing their face - most are being sporadically chunked - meaning dedicating cures to anyone but the tank at that point is a risk in itself). Tet/Ben are only two safety nets, and one of those is almost always negated within its own GCD unless critical or sealed.Hell I was in Baelsar's Wall yesterday, and we couldn't do the first big pull because the healer didn't know how to Esuna, use Asylum, Tetra, Benediction, etc.
Chances are if you Asyl and/or MedII (which most will panic button due to the 'OH SHIT' factor) then the Healer is going to enjoy picking up some stray mobs to boot, and they don't exactly hit like wet noodles. Stacks ensure nobody has Stoneshield at this point. It's on the Healer if they choke, but it's not always just them if things go south. I have no personal problem with it, just I understand when some do. Also translates when I get Bael on my PLD - tend to just grab the first two packs if nobody is communicating at start. In either case, I'd rather secure a guaranteed two-pack clear vs a chance at a tri-clear // chance of a wipe that then has us doing a late two-pack anyway. Problem is most just say "Hi" then go autopilot. If people aren't comfortable, it should be said before sprinting off.