Except Xenogears based all its terminology on actual things in Gnosticism and it all made perfect sense both in the textual and metatextual sense.
And please, Squall and Yuna really don't compare. Squall's leather outfit may be considered sexy, but it's also a power fantasy to men, much like you could say Batman's outfit with its exaggerated muscles may be alluring to women, but it's main function is for you, the male, to project yourself into this rich crime-fighting playboy who has the perfect body with which he can dominate stuff and have all the ladies. Likewise, Squall has the perfect model face and cool leather clothes because that's the beauty ideal in Japan, so that you can relate be that super cool guy that kills things with a gunblade abd get the hot chick. Female sexualization like Yuna's or Lightning's doesn't make them power icons for women. They're stripped down to look more accessible, so to speak, in some outfits even submissive, all with the Male Gaze in mind. They're really not there for the women to feel better about themselves. Compare that to another controversial example in Bayonetta where the main character is, indeed, very sexualized, and yet that's the whole point of her character and she totally owns it with her personality. Bayonetta is perfectly aware of how sexy she is and she likes it, and it gives her power and control. So here's your power fantasy element that is not present in sexualized FF females. And yes, Vanille's moans are definitely evocative of an orgasm.
All I'm saying is there's a difference between being portrayed as sexy than being portrayed as a sex object which has happened to female characters but not the male ones. Even the Yoshida examples don't really make things better. True, he sexualizes both the male and female form, but no attention in-game is brought to Ashley Riot's ass cheeks writhin the game - the camera doesn't focus on them, he doesn't like to stretch and show it off seductively to the camera, and yet we still get close-ups of Melrose's ass. Similar things can be said about FFXII - Basch is wearing assess chaps during his prison escape sequence, but you wouldn't know it without looking for it, but you know all about Ashe's skirt and Fran's uh... attire.
Now coming back to Mevius - if you remember the initial announcement of the game, the main protagonist was first seen not only in an outfit completely exposing his entire side, butt cheek included, but also in very submissive poses. It did seem like for once the series wasn't pandering to the Male Gaze, but the Female or Gay one. And notice that no one got angry about Ashley Riot, but the backlash towards this dude was so huge that they actually changed his outfit. There is definitely a double standard.
Thankfully, it looks like they've fixed Cindy's fanservicey nature in XV. In those 50 minutes of gameplay it looks like, while she still dresses the same, the camera no longer fixated on her assets, so she's more the energetic character they intended her to be than a pair of boobs for the audience to ogle.
That's kind of the thing - FF isn't particularly bad at the sexualization thing. This is a gaming problem in general. FF has actually given us consistently good female characters, with only some recent excursions (LR) really going into that shameless pandering area that's usually reserved for creepy otaku games. Nevertheless, it seems Tabata once again is a very reasonable man that does remember that women are people who may like their games too and decided to let Cindy retain her last shred of dignity. So while FF may have a general problem with sexualization, it isn't larger than in most games, and they atcleast try to sometimes make it equal opportunity. Yoshida is just too good for this world, I guess. Bare ass cheeks for everyone!