for me, it’s pretty confusing in quite a few instances, but, just to give an example: if the striker shoots and the keeper saves it, but the striker taps in the rebound, how is xG counted? is it counted twice or just once? or, what if neither shot goes in?
I always found it stupid. A shot taken by Harry Maguire whilst he’s falling backwards in a December snowstorm surrounded by ten defenders, gives the same xG as a shot taken by Haaland calmly picking his spot vs the keeper one on one on a sunny August afternoon - if taken from the same location on the pitch.