What's important to consider is that this problem isn't a problem because it means healers are likely to be barred from Ultimate prog parties, because they won't be. The issue stems from a fair chunk of the healer community being unhappy with the state of healing for 4+ years at this point as a result of a lack of gameplay. Healing requirements are incredibly low across the entire game respective to the type of content you're engaging with, meaning how much you actually need to use and engage with the roughly 20-ish healing and mitigation tools available to you is incredibly limited. Meanwhile, the gameplay you get to engage with when healing isn't needed is strikingly similar to the gameplay a BLM player has around Level 6~Level 15, and that will account for upwards of 80% or more of the time you spend in a fight. This is not what many healer players what. When this concern was brought up with Yoshi-P, the response was to play Ultimate content if the rest of the game wasn't satisfying for you as a healer.

If the healing requirements of an ultimate fight are so low that it's even possible to clear without any healer at all, how is anyone unhappy with the state of healers supposed to 'enjoy the challenge of Ultimate' even if that was a satisfactory solution to the problems these players have?