Sounds more like you´ve never played another MMO or are not able to compare them properly.
Action - MMO´s have a complete different gameplay and even there you sometimes fight skills with a "from behind effect". But that positionals are not that big thing there is obvious. You´ve to target the enemy by yourself and the overall gameplay is much faster.
Comparable trinity MMO´s like SWTOR or WoW are slightly different too. Classes have way more utility options and everyone in the party has mostly do way more mechanically wise. You´ve a rotation to play, but overall it´s not 123 with a 2-2,5s GCD as it is in FF14. You´ve 1,5s or even less. On top you´ve to take care about your ressource management, off gcd´s aren´t a big thing, but priority-skills are and gapcloser are GCD´s too.
This last in a way faster and utility-based combat design meanwhile you HAVE to take care of ressources. (Which is not a real thing in FF14 anymore.)
That said, classes in FF14 have a bit but are overall way to easy to play. SE´s whole balancing works like Jirah mentioned. Procc gameplay on RDPS, Casts + Dots on Mages and therefore positionals on melees. This together with a braindead 123 rotation. And next to NIN with his mudra, DRG with the jumps or SAM with Kenki + Midare, MNK has nothing but positionals.
So if anything, MNK needs something on top on his positionals again since they took GL away.
I´ll never get why so many mighty casuals, who don´t even play the endgame, come up like "pls change the class for my own preference."
You guys can play any content out of savage without even care about positionals in any way. Man yesterday i do even had a lvl 80 BLM casting fire into trashpulls. We needed 30mins for matoya´s, who cares?!
Stop destroying classes because you´re not willing to learn them properly and just like some punshing aesthetics. It´s ridiculous.