Quote Originally Posted by squark View Post
That's because it's a stupid hypothetical thought exercise, and in reality you cannot act upon a non-entity, you can only act and imagine that it is affecting a non-entity. Whether it can be proven valid or not through formal logic doesn't make it true, nor useful.
Truth for Ti is not a tangible practical thing in outside reality. Let alone "useful" on its own. It can be very useful when applied, of course but not really its main point to be useful like Te. It only focuses on usefulness for its own ends which are less tangible than Te's agenda.

Ti with Se will of course have a more practical bent and it will apply on objects in tangible reality and be more directly useful in this way than Ti with Ne but it still has this fundamental quality and difference from Te.