I agree with the general approach here but not with the details.

It may well be true that the president can affect how $1T is spent over four years. But that doesn't mean that the difference between one president and another is $1T over four years.

(I mean, it could. For instance, if that $1T is spent on munitions that get used destructively in a war whose other net consequences are negative. But most of the controversial things federal money gets spent on are of some value either way.)