The issue is, how many accidents or injuries have been caused by these extra checks, and how many will be prevented by them?
The MOT test was supposed to be a check of significant main mechanical components, not random things which might not work at some or other indeterminate future time.
Yes the MOT test was originally intended for checking those things but car technology has come a long way since then! It has to be relevant to today's cars. I would say that some of those if not all of the extra checks are vital to cars which have the tech fitted.
Going back to an earlier post regarding a vauxhall corsa and the garage saying ignore the light because there's loads of things it could be and most are not important - that's just pure ignorance And lack of knowledge of their own trade. They might have been better tone honest and say "we ain't got a clue so can't help you"