As others said, he got rid of us.
However there is some merit in what you say, and in the argument that if he had focused a bit better on attacking play we might have done even better. Maybe this departure will work out well for us, but we will never know.
Following on from what you say, and considering this sanctimonious attitude Spurs fans and club official have about the way they should play, it is not inconceivable that he is going to be in real trouble, real fast, and he could well be gone by Xmas.