The only bad thing about you doing this is the extra work you are causing your other healer. I can see if you were doing it with a full party fc that was OK with it since they would be your team, or a single healer dungeon, but you can't always see how your actions negatively effect the party as a whole.


(let's say)
The other healer died, why? He was trying to keep others alive because your heals were not strong enough. Or maybe he was low on mp for seem reason or another. Maybe your regen could have saved a few people lives, reducing the stress and work for the other healer.

These are just hypothetical, but so many things could have been effected.

I'm fairly sure taking off your soulstone and being a class rather than a job you lose a LOT of mind.