You are assuming everyone owns a PS4, which couldn't be further from truth. Switch will surely surpass PS4 before next June (that's when I think it will be released).
Also, are we now taking the ToP port joke as truth? With how well Switch is performing?
The niche that cares about having the best graphics do own a PS4 though, it just so happens that niche is tiny.
Phantasia is still a (not implausible) joke but the Tales release isn't going to be anything special.
So what would really be the point of this version? I'm asking seriously. It's sales potential is gimped and unless they're trying to milk everything they can out of this game, what's the point?
You answered your own question.