Unfortunately individual shot data from StatsBomb is not freely available (only cumultative for each player) and Werner's output was 0.6 xG against Newcastle and 1.0 against Rennes so we can deduct the probability for each shot from that. Only shots are recorded. Another source I use (by a guy who watches and records every single shot manually and whose xG numbers match goals scored to a tee) has Werner's shots against Newcastle at 0.15 and 0.35. I'm pretty sure you thought those numbers would be higher. And so did I in fairness, particular the second one.
This is why it's dangerous to trust what we think we have seen. We are all biased to some degree, by club allegiance, by what we hear from pundits or by our own memory because we have seen similar shots being scored in the past, maybe even by the same player. In general fans and pundits vastly overrate the likelihood of chances being scored. Think of how often they say on TV "oh he should have scored that" after a header from 10 yards out which is ridiculous (which header even has an xG above 0.30). If we went by that we would be seeing three or four times as many goals in reality. Shooting from an angle, being under defensive pressure and even being a further yard out dramatically decrease the chance of a goal happening. That's why I don't like the term sitter even if we use it meaning 'big chance'.
I agree with your last sentence. I don't think Werner is world class (whatever that means) but I said in the summer that for 50m he is an absolute no-brainer purchase for Chelsea and will be a very good player for them
Yes, let's ignore hard evidence and go by what someone claims to have seen (see above). Someone also tried to tell me recently that Arteta has improved Arsenal because he 'trusts his eyes' when all data points to the contrary.
I have also 'seen' those four chances by Werner, infact I looked at each one of them again before posting. And he did not miss four sitters, that is just factually incorrect. Saying he missed two big chances? Fair enough although, again, I would not be reading anything into that.
Here is the still image of Werner's first shot against Newcastle:
Roughly 16 yards from goal, at an angle (hard to get past the goalkeeper from there) and under pressure from two defenders. This just isn't a big chance. He actually did pretty well to place it in the far corner but the keeper got a hand to it resulting in a corner.