Here's the thing-
KMMO's typically have really great armor designs & character creators & a terrible to an almost non-existent story like whatso-ever
So, KMMO's:
1.)Great armor/ outfit designs
2.)Typically amazing character creators
3.)Terrible story,
4.)Lackluster combat,
5.)Cash shop/ Pay to win heavy

FFXIV:
1.)Terrible character creator
2.)Mostly 'meh' armor & outfit designs
3.)Great story
4.)Fun combat
5.)Housing - & the only pay to win related thing is mog station insta levels for jobs

So, comparing it to a KMMO is abit silly & over-analyzing

As far as wings go-
I've never liked the idea of the backwings in anything with a few exceptions--
I couldn't stand GW2 because everyone had just terrible, massive backwings- it broke the immersion so much when everyone ran around looking like a giant rainbow fairy firework- aside from anet literally lying constantly to their playerbase about everything, the armor designs were just as questionable

I hope backwings isn't something SE makes consistent, but most players have terrible fashion taste anyways & lack creativity, so I see backwings being more popular & requested.

Yet, As long as the story remains as solid as HW & ShB, upgrades being made to better the game itself, if the only issue is SE releasing ugly backwings- You won't see me complain (much) or make drastic comparisons to KMMO's