Well firstly there's the bit of my post you've taken out of the quote. Second, he's the holding midfielder for a team that ships goals like they're going out of fashion. Third, there are considerably better players available at clubs that don't hate us and would be more likely to do business. Fourth, for a relatively young player he misses more games than you'd like. Fifth, he's nowhere near as good on the ball as people think he is. Sixth, he makes a lot of little errors that don't get coverage because he doesn't play for a top club - which is why Southgate doesn't use him as the main holding midfielder. Seventh, I'll refer you back to the first point about him and his whole family hating United.
I don't even dislike him as a player, he's alright, just not a player that we should be looking at. In a world where a player like Ruben Neves is potentially available, signing Phillips is absolutely ridiculous.