Christ, nothing stops the Momotaro train (ba-dum-tsh).
Great numbers for Super Mario RPG too.
I dunno. Persona 3 Reload started active development in late 2019. By that point, the Switch was a massive worldwide success, it had proved itself a very good fit for JRPGs, people had been asking for Persona games on the system for a couple of years and Joker had already been announced as a playable character for Smash. With all those factors, the remake should have been developed with Switch in mind, but that clearly didn't happen.
Atlus shouldn't ignore the Switch ecosystem in the future, I totally agree, but they absolutely can do it if they feel like it.