He had a better uair in Sm4sh. It covered horizontal range really good. It was also safe against shields, making it difficult for the opponent to just shield grab him. His uair got a buff recently, but only for even lesser landing lag, which honestly, I don't really see the difference. It's not like they gave his uair better horizontal range or made it difficult for people to fall out of. His dair was already good, and I guess they made it better now. D-smash doesn't always connect when hanging off the ledge or close to the ledge. Some characters have recoveries that keep them from getting hit by the attack, and some characters like Mario, Link, Marth, Lucina, Roy, and some others hit Ness before connecting to the ledge, preventing them from being flung away. PSI Magnet feels like it has a slightly slower start up compared to what it was in Sm4sh.
I think two buffs could really help him out. A bit of a horizontal hitbox on his u-tilt since it whiffs at times, and a better grab range. He's not OP. He may be good, but I don't think he'll be getting nerfed the next time around. People were complaining about how difficult it was to escape PK Fire, but people got wise and learned. Nobody as far as I'm aware is complaining about Ness, so Sakurai or whoever probably aren't even looking at him.