And fortunately or unfortunately, Royal outright replaces Vanilla to the point where there is little to no reason to go back. 3 and 4 both had strong points to every version of them to give some reason why Vanilla or Portable or Golden were worth sticking to, but with 5 its straight up upgraded in every way.
I didn't finish Persona 5, but learning that it was getting an enhanced edition, Royal, took the wind out of my sails for restarting my playthrough.
And fortunately or unfortunately, Royal outright replaces Vanilla to the point where there is little to no reason to go back. 3 and 4 both had strong points to every version of them to give some reason why Vanilla or Portable or Golden were worth sticking to, but with 5 its straight up upgraded in every way.