The problem with phantom jobs is that they aren’t actually a “system” per se. They are a few collections of vaguely related lost actions with the interaction carefully stripped out of them and called a system
None of the jobs really even synergise with themselves let alone synergise with your actual job or other phantom jobs. A few have semi interesting “core loops”; namely monks kick buff upkeep, oracles prediction and excog heal, beserkers big hit being linked to damage taken during rage or time mage using haste to remove the cast time on meteor. But even those jobs have other pointless skills thrown in there that really don’t do anything. Monks counter stance like oGCD has nothing to do with its buff, the doom or invuln on oracle have nothing to do with the prediction loop, the dispel, slow and addle have nothing to do with meteor on time mage etc
And that’s the jobs that I’d consider good. There are others that are just dumping grounds for pointless utility like bard or knight, jobs that are functionally fodder for forked tower like chemist ranger or thief and the remaining few like canoneer is just a few damage spells on CD, geo is basically a class only the MT can use and samurai may as well not even exist
So with this system you basically have only the most useful jobs actually doing anything and the rest being a collection of vaguely related utility you mostly don’t use and almost none of the jobs; again with the slight exception of the well designed ones; actually change how you play your actual job and most of the ones that do basically amount to “put yourself in damages to do a lot of damage” which really only benefits the tanks