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Please elaborate on them being 'the most point invention ever'.
I don't see a single disadvantage in a camera having one. They don't get in the way or add any bulk and the fact that cameras (even high end bodies) are still being produced without them is mind blowing to me.
Yes I'll agree you don't 'need' a tilt screen but they are bloody useful, especially on the Sony bodies where you get the benefit of full phase detect while using live view.
If I want a low angle shot I don't have guess or put my face in the dirt to frame the shot how I want. If I want a high angle shot I simply pull the screen and look-up and hey presto I can frame they shot properly.
this ^^