Ha! I'm not so sure I agree with you, regarding your first point. I think our decision-making on when (and when not) to shoot is pretty good, and can't think of (m)any examples from last season when we should have shot and refrained from doing so (Knockaert occasionally has a propensity to be...
My view is that, beyond the goal we did score (which might not be a XG), we had two of the best goalscoring opportunities (Jahanbakhsh and Bissouma), if not the best in that game, so I'm surprised to see what the XG came up with.