While I personally would prefer a facelift for the older characters, I do feel we could do with a few more female characters to depict a wider range of what a woman/girl can be.
I'm sure it's no surprise that I personally think there is more you could do with the existing female characters, if given the proper polish and work, but I can somewhat also understand, if others feel it's a bit too late to try and do that.
Honestly I don't think we even have a 30/70 split between female and male characters at this point. Like you said it doesn't have to be perfectly 50/50, but I'd at least like it to be closer to 40/60 that it currently is.
I also completely agree that only having one female party member per game has been an odd choice that needs to stop moving forward, especially now that we can have 2 guest party members per world.