I can see why, from a technical perspective - The Psp port did away with the animation(thereby lacking a significant amount of expensive assets that would have had to be re-done), and had a darker, sci-fi-ish 'team to save the world' feel, whereas P4+P5 was more about 'slice-of-life'/'coming-of-age' that is unfortunately more grounded in Japanese youth culture, and therefore seems to include 'segregated by gender' more heavily than P3 already was(Meaning it would be way more expensive to re-write). I would love to play as a girl again, though - Especially in P5. (Although I think I might like the Rise romance link more with a FeMC.) I hope that Atlus will give us a female main character next time around. Or at the very, very least give us another gay option for the protagonist to date. (While I love, seriously love the subtext in Kanji's route, there was no way of spending Christmas with him .___. )

Have you played P2? The gameplay is dated, but there's a gay option. (Who wasn't meant to be, but the dev team were like 'Uhh, it'd make more sense for him to be the canon love interest than any of the girls' so they went there.) It also features more mythological themes, much heavier than P4+P5.