He's also become a bit of a tactical headache lately. The best way to utilize him now is probably in a 442(like Valverde basically did) or a 3 back with wing-backs.
He wants to play in the center, but doesn't really offer movement off the ball. He comes deep to collect the ball unnecessarily at times. People kept blaming the Barcelona midfield(but their midfield is probably better than PSG's in terms of ball-carriers and penetrative passers)for him dropping deep, but that's what Messi wants to do. During losses of possession, he will refuse to track back and doesn't really press(Mbappe is also guilty of this).
I feel like he should adapt how he plays slightly and stay a bit further up the field, but I doubt he will. I don't think 'MNM' are an optimal fit at all either.
Individually, he is easily the best player in the world, but in the confines of a team now, he probably isn't. Which sounds paradoxical I know.