Pochettino is a great kid, good looking, too early to be tainted with any antics, very careful how he carries himself in front of the cameras, well dressed, very capable of developing young players, but, he is very naive when it comes to actual games, and for that reason he will never ever be a great manager. He is passive during the game and reacts very late when things not going well. At some point fans will lose their patience, if they have not already.
I get it why people want him at Utd, I was one of them too. But, he is proving he is not Jose or Pep material. Smart, but not genius. He might win a title in his career, but, he is not a serial winner. Jose had already CL and League titles under his belt at his age, same Pep.