Good summary of his strengths and value to the side
This is one of those changes to the game that I don't think a lot of the football-viewing world has fully caught up to yet. When people think of the guy at the base of the midfield a lot of minds still automatically go to an energetic, terrier-type, like a Makelele or a Kante, but that's not really the job any more - most of that aggressive pressing and harrying and ball-winning is now done by the forwards in a high press, and the DMs are now the ones getting chased down! The job has become more about being able to take the ball under pressure, turn a marker, wriggle out of tight spaces, and break lines, either through ball-carrying or quick distribution. Don't get me wrong, TP is still a very good ball-winner when he has to be, but it's not really his super-power and it's not what makes him so effective in that role - it's actually a fairly minor part of his game.
Whether you could call his time here a success is up for debate - it's taken him a while to find a role that he really owns (probably more of a systemic issue than an individual one) and he's spent as much time out injured as he has available, but when he's on it then he really is immense and does the job of two men.