Lets face facts: Royal Menagerie, in terms of difficulty, easily is on the level of some Ex Primals.
The thing though is: Many people never do Ex Primals. They have no interest in that, they don't have the time to practice their FFXIV job endlessly, they have, you know, lives.
Yeah, I can hear already all you really expert players say "but it's not hard, leave it as it is" and "but the finale of the MSQ should be hard", just as "but once you get better gear in a patch or two everyone can faceroll it" or even the atrocious "git gud".
But no. There is a considerable part of the player base who MASSIVELY struggles with Menagerie, and that is even without disabilities or health issues or latency coming into play, that make some players UNABLE to ever beat something of that difficulty, period. And telling people to wait until they get better gear, which is difficult to get if you don't finish MSQ, also not okay.
People who play FFXIV only casually (the majority, and that.is.okay) also deserve to enjoy the MSQ instead of having this massive source of stress and frustration at the end of the story line.
Don't get me wrong here, I managed Menagerie just fine, but the amount of wipes I see in there is ridiculous. And I know people who due to health issues are all but kept from finishing MSQ thanks to this. Not.Okay.
Therefore I think it would be good to tune down Royal Menagerie for MSQ, and keep the current difficulty as a "Hard Mode" option, maybe even to chose from "normal" and "hard mode" right away as you enter it the first time to finish your MSQ. That way those who want a challenge to finish the story of SB can have that, and all the players who would struggle with hard mode (or unable to finish it at all) can enjoy the end of the MSQ without stressing out or quitting out of sheer frustration.