The Switch and PC ports were handled by Durante, best known for making a mod that fixed the Dark Souls PC port. He's a pretty big name, and he does all of the Trails porting, and he goes above and beyond with them.
Some of the changes he does includes:
Making textures better (and I mean remarkably better, there are some signs that are unreadable on PS4 that you can read on PC and Switch, this isn't a minor thing).
Adding several game options, including the ability to turn off random encounters if any of your party members come into contact with an enemy (because your party follows behind you in these games), change exactly how fast you want the high speed mode to go, change the scale of the UI to be bigger and the ability to show what BGM is playing at any given time
It also adds a backlog, and if you're like me and just press buttons at complete random sometimes, that's a godsend because it let's you look back at the text.