Was my first reaction. Not going to lie, I thought this might be a troll post. But either the OP is taking the effort too far, or is actually serious. I'm leaning towards the latter a bit.
So.. lets get something out of the way. Healbot is, in case many don't know is an addon made to work in WoW's LUA environment. What it does is allows the healer to map different heals to different clicks. You can left click with a regular heal, right click for a heal over time. Or any combination thereof. I think it allows alt, shift, and ctrl too, but I've not looked into it in.. probably a decade. You can click on the person, their party portrait, their raid slot, or even other addon's listings of players and such (like Grid and other addons). Its made with compatibility with mind.
As you can imagine, its quite useful in a raid setting. However. There's one glaring flaw to the addon that has been present for a long time. Dependency. And if the OP is legit, they are suffering from this issue. Because of how Healbot is used, it can cause a detriment when the addon isn't available. It wasn't uncommon after a major patch to not be able to raid the night of a patch because of the healers in the raids unable to patch their Healbot addons immediately after a patch. And as you all can see here, the OP cannot use it in FFXIV for obvious reasons.
I want to be clear that I am not suggesting that healers that use such an addon are bad, nor that they are any less skilled. The addon automates nothing. It only allows for an easier to use interface. But players have a tendency to get comfortable with interfaces. When they have a drastic change forced on them by a patch or a new game, they will struggle. It does change the experience that much. Some players are more adaptable than others. Some not so much.