There's little point in adding a 'butt slider' unless they're willing to tackle the much more dire problem of 'Ken Doll' anatomy for male characters. It doesn't have to be anything lewd, just enough to show that there's something there. Make it optional for those with an allergy to male characters who are designed to look like they don't have a dire shortage of testosterone. For those who say it isn't appropriate, look how tastefully it is done in Overwatch (a game enjoyed by players of vastly varying ages) and consider some of the themes explored within FFXIV itself.

I do hope that we see a major update to character creation at some point. It's sorely needed, especially for some of the neglected playable race/gender combinations.