Healer is the primary role I play in FFXIV, and I've never taken issue with this. I just roll with it. If the tank dies within the first 15 seconds of a trash pull/boss fight before full buffs can be applied, no buff is going to fix the fact that there's something severely wrong with the tank (or the game mechanics).

If you try to min/max your DPS as a healer in a random DF group... ...you're gonna have a bad time.