I may be completely off base here, but aren't Ultimates literally the same thing where everything is still on a timer. Raid wide goes out people need to be healed, tank busters go out, but there is more of that damage going out and you need more focus on party mitigations similar to savage before everyone is completely geared out? I have not done them yet but I highly doubt things will be random it is just not in this games nature to be random with certain things unless you are playing with accident prone players which is indeed fun and challenging. This is not learning how to parry in dark souls or trying to master backstabbing and parrying to take down Abyss Watchers. Even still you will not suddenly have a rotation on whm like they promised in a live letter before EW for aoe holy lilly being a combo. I will eventually attempt Ultimates but I highly doubt once you memorize the fight it will no longer be challenging way less after people make barely any mistakes in all content.

That isn't to say it wont be challenging but I feel as though there is either a translation issue with what people actually want or what they even understand about what people are asking for. I really just think Yoshi P needs to go on a stream and level whm and be stuck going through the ARR grind the whole experience not just edit his character to 90 and test at end game. No one plays healer on the dev team correct? I think even if they do not want to they should try it on out and tell us if they are having fun.