Yup, I see it as well, as Tank, I end up being the one to SS and Protect the group. It seems that lots of Healers get into the easy mode.. and that's not only from Brayflox, it's every trials and dungeons.. some will just not BUFF.
As for the part where you are partially to blame - Communication is key. Never assume. While opening the last door, if a Melee DPS is with us, I'll ask him to LB the Big bomb, or better.. the boss so he won't even have the time to put it in the first place. If no Melee, I tell the SMN/BLM (BRD? lol hehehe)
(Heya [insert first name] we'll leave the LB to you for the big bomb or Boss. We'll trust your judgment ^^) <-- simple.
I hate speedruns; so if you see me with you, prepare for it or.. get that 30 min penalty. I'm here to play a game, I can wait one more week to get my stuff, enjoying the moment, with friends, or making news ones through DF! <-- how is that even possible?
