This idea that giving healers more DPS actions, adding more agency in MP usage, having more dynamic combo branches, more balanced choices to spend gauges on, use of positionals, and other discussed elements of gameplay will make all of FFXIV unplayable to the common player, or even just the casual player, is absolutely ridiculous. And we know this because Black Mage exists. If having a higher ceiling was the death sentence that a select few claim it to be, then Black Mage would be ostracized from so much content because of the fear that the Black Mage player a particular party got wouldn't have the skills to clear the dungeon roulette, the alliance raid, the whatever. But that isn't the case, because even if someone isn't a great Black Mage, they are still doing what 95% of the game asks them to do, and might still very well be capable of getting through savage anyway. Savage DPS requirements are not that tight, particularly after weekly gear is being collected, and the majority of people who do savage are not week 1 raiders--the only players who do need to step up to meet the very tight DPS requirements of a week 1 savage tier. These are also the players who have the skills to meet those requirements, and generally are fine with having more complex jobs.