I disagree. Marginalizing scoring chances to an average is inherently flawed IMO. Much like shots, scoring chances are also not created equal.
Over a career, maybe thats enough attempts to marginalize, but even a season for me is not enough.
I hear from enough hockey coaches, players, ect saying things like "we can't give up the opportunity from there, or chances like that, ect". This tells me that there is more to the story.
Now, I can see Fenwick being an indicator for how good of a puck possession game you play....
That's certainly true that all shots are not created equal. Clearly a breakaway and a rink long attempt to beat the buzzer are going to have wild statistical difference in save %.
To me, it's almost impossible to differentiate, however, unless you do a shot chart like they do in the NBA where you divide the ice into zones, track shots from those zones and measure shots that get blocked, re-directed, etc. It would take a serious analysis to do and it's certainly not being done to my knowledge now, but it would certainly be interesting to know.
For example, last year, it felt like we got killed in the center of the ice at 15-25' out from the net. The turnovers and shots from those regions seemed to have gotten buried whenever they occurred. Was this gut feeling accurate or just the a case of mind over reality.
TL
R - I think some of the advanced shot statistics correlated to goaltender would be interesting in ascertaining the strength of various goaltenders and how better to deploy your defensive assets to better cover the high percentage scoring opportunities.