You have to understand Japan still largely treat gachas as kusoges unworthy of major investment and only exist as quick cashgrabs. Their competent-ish developers are still firmly entrenched in the traditional AAA space due to out of touch boomer corporates, where they still believe in antiquated metrics like "units shipped".

For Japan to have a new breakout gacha hit they'd have to do something radical the same way that Mihoyo did with Genshin.