Ultimate says hi.
Ultimate is content where you do need that much detail to clear. It’s the only content in this game where 7 people literally cannot carry an 8th who refuses to contribute. They can’t even carry an 8th who doesn’t have a decent understanding of the job they’re playing—my UwU static’s first NIN decided to go MNK for two weeks, and we actually missed DPS checks on some of the primals because he did not have a decent understanding of how MNK functioned compared to his understanding of NIN, and the rest of us just could not push enough personal damage to make up for his massive shortcoming. We did a V6S weekly to help one member get some pieces for SMN (since it was determined that we actually needed a caster for caster LB3), and our NIN - on MNK - did 200 more DPS than me... a BRD. And we were equally geared, except they had an i370 weapon where as I had an i375. Other than that, we were both BiS.
Clearly there was an issue with regards to their performance, and what told us that? A parser.
Parsers can’t force people to improve, but guides and handholding can’t force them to improve either. This game literally holds the hands of every player through most content, yet people still make threads complaining that MSQ instances are “too unforgiving”. The only ones who can make a player improve are themselves - they have to have the motivation to do so.
At least with a parser, determining exactly who is being a burden in weekly clear parties for Savage or primal mount farms would be a lot more obvious, and could be instantly addressed rather than wasting several pulls trying to guess who the problem is (for those that aren’t already parsing the encounter, anyways - not like we’re allowed to say anything though; we’re apparently expected to just grin and bear it). And it would also be nice to have so that the problem player cannot spin the situation around, and try to blame another player - because, boy, I’ve seen that a lot: you call out the underperformer for underperforming, and they either try to blame you or another party member for their shortcomings.