I am however a bit dumbfounded that you find these rather innocuous examples to be cases of cheating.
For gamers coming from other wargames, any form of unapproved measuring is outright cheating. For example, if you have too much measuring tape out, or you're using a ruler, it's expected that you leave the extra behind your model. If I'm moving 4" but my ruler measures 12", and I happen to put the full 12" ahead of my model, that's cheating.
So X-wing's more lackadaisical approach to measuring feels off to a lot of experienced minis gamers. To that background, statements like "Not our fault that the ruler reaches out to R3." are flat-out cheating. You can indeed control your ruler so that you don't "accidentally" measure more than you should.
And again, it probably wouldn't be nearly as bad if they were consistent. We still don't have tight rules that cover the timing on measuring, action declaration, and takebacks (for example, we all know you can undo a TL if the target isn't in range, but what if I declare Squad Leader and the recipient has no TL targets in range, and has already Focused?). The fact that actions that would be absolutely incontrovertibly cheating once the first planning phase begins are perfectly fine a few seconds before that is also strange.
So agree or not, there's plenty of reason for the "why".