That's one hell of a double standard.
If you break down the healer's responsibility to "heal and Esuna from time to time" with everything else being optional, you can also break down the tanks responsibility to "pull as much as you're comfortable with and keep the mobs from whacking the party" with everything else being optional.
No matter which role you play, of course you should use your CDs appropriately, be it dps boosts, oGCD heals/ mitigation/ party buffs or def CDs.
If you're keen on making everything about tanks, let me turn the tables for a moment and make everything about healers:
Healers are expected to know damage patterns and recognize tank busters by name, recognize actually detrimental debuffs right away, keep the party alive and heal them even through failed mechanics or poor CD timing, manage their MP so they can always raise someone who died, use their oGCDs properly to free up to dps and dps as much as possible.
If they die from something, even it wasn't their fault, it will likely result in a wipe and they get blamed. If the tank can't pull as big as he wants, they get blamed. If the tank doesn't use his CDs properly, the healer is expected to heal it and gets blamed if he can't. If the dps is low and mobs don't die before the healer runs out of oGCDs and maybe even MP, the healer gets blamed. If a dps eats a mechanic and dies from it or has to wait longer to get healed, healer gets blamed. If a healer isn't able to carry the group through fails it's seen as a failure on their part.
Tanks just have to stand there and get whacked and dps just have to stand there and whack things.
Sounds one sided?
Precisely.
It's a bonus if the tank already knows the dungeon well enough to lead the way and knows trigger points for mob spawns. Just as it is a bonus if the healer knows all damage patterns by name and intensity.
But dungeons are so liniar that it's basically just going where something is still alive and simply being the first one to throw something in the mobs face isn't rocket science.
And though you'll likely heal less efficient if you don't know the damage patterns, reacting to them after it happened is fine. You may start to panic heal a bit if the group drops and you don't know the next aoe is still 20sec away but it's not the end of the world.
I think you're just making things harder for yourself by thinking everything is about you because you're the tank. It's not. Take a step back instead of thinking the whole responsibility for a nice, clean run falls on your shoulders alone.