I'd say for me the biggest problem with your use of quotes is that they appear sometimes to be more about ending a discussion than beginning it. The implication of Einstein (or Newton, Aristotle, Bohr, Schroedinger, ...) saying such-and-such is that, well, here is what a genius thinks, so it's surely correct. I've no idea if this is fair or not, but it sure feels that way at times. It's an over-reliance on authority (and anyway risks misinterpreting the point of the original quote, or is overly selective) that doesn't really move anything forward very much, and can be quite frustrating to try and engage with.
Not that my exhaustive, at-the-character-limit, spread-across-two-full-answer-boxes posts are necessarily much better for engaging with (I'm sure I talk too much), but at least it's original content. That runs the risk of being wrong, of course, but it's a risk worth taking I feel.