Your response is exactly the reason why I almost never quote “expected” goals. No one has any idea how it’s calculated or what it means. I just did a quick search and found this article. It says nothing about the number of bad plays in front of the goalie.
Not all shots are the same. Expected goals helps us understand shot quality on a variety of levels: by player, by line and by team
www.nhl.com
If you read an article like that and come out with a decent understanding of xGA, kudos to you. It’s complete gibberish to me, and I have a Ph.D. To me, “advanced“ stats in hockey just mean “opaque”.
There is absolutely nothing complicated about GA/60. The aim of this sport is to score more goals than the other team in 60 minutes. You’re on the ice when a goal is scored against you, that’s counted against you. If you’re a defenseman, you have a big role to play in terms of keeping the puck out of your own net. Sometimes you get scored on and it’s not your fault, but if it happens over and over it gets harder to ignore.
I think you missed the /60 part of the GA/60.