They could do this, and frankly I would prefer it, but that would also mean giving up on gacha as a revenue source, which outside of regulation making it no longer viable is really unlikely to happen IMO.
Games like Genshin Impact have already proven that phones are capable of handling console-quality games, so it would not be hard to do this. Put it on mobile, use the Sony connections through Aniplex to put on Playstation, I'd say a PC port would be nice as well but like, lmao.