As much as I love Phoenix Wright I am fully against Phoenix Wright in Smash.
He's really not suited to fighting games, except for the role of a novelty character, where the whole point is that he's amusingly out of place. And, we already got him playing that role in MvC3, so we don't need it again.
I'm not sure I get your idea of 'not suited to fighting games' when it comes to Smash Bros. in particular, since Smash Bros. is most certainly not your traditional fighting game.
When has being suited to fighting games ever stopped Sakurai with some of these outlandish picks? You really think characters like Pac-Man, Ice Climbers, Isabelle, Duck Hunt Dog, Wii Fit Trainer, Piranha Plant, R.O.B. and Mr. Game & Watch are suited to fighting games?
You're talking about a game where you can put a chubby green dinosaur up against a space bounty hunter. Or team monsters and demons up against talking animals with space laser guns and a metal man. Or a vampire hunter against a plant. Or an electric baby mouse alongside a fallen angel with one wing. In a roster as huge, diverse, and outstretched as Smash Ultimate, either every character is out of place or none of them are. That idea is absurd. If you told a group of college kids back in the late 90s-early 00s this would happen, they'd ask you what you were smoking and where could they get it. The whole concept of Smash Bros. is ridiculous and outlandish. That's what makes it Smash Bros.