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There is a lot more area on the perimeter than in the lane.What evidence do we have that it ruins spacing? I think putting 4 or 5 shooters on the perimeter ruins spacing.
As I have been saying since I was calling for Carlton and Whaley to play together, all of these three point shooters on the perimeter are getting in each other's way, and 3 point shooting percentages have been dropping for decades. Many basketball statisticians do not understand the concept of a marginal event. 30 years ago, the total NCAA 3FG% was 36.2%. In 2021, it was 33.9%. The number of 3's taken increased significantly. Assuming that 3 point shooting is consistent over the years (will get back to this later), those incremental shots are likely at much lower than 34% rate. Is an incremental 3 attempt that has a 25% or 20% chance of going in a better shot than a 2 point shot by a center that has a 50% or better chance of going in? Of course not. But that is exactly what coaches are doing, jacking up more 3's with offenses that are not creating that many good 3 attempts. If you want more good 3's, you need to pull the defenses in.
I would also argue that 3 point shooting ability is likely much better than it was and yet shooting percentages are down. I believe the reason for this is that teams are taking bad 3's. If you want to see evidence of this, look at the UConn backcourt and wings. Almost every one of them is having the worst shooting percentage year of their careers. These guys can shoot, but shooting out of an offense that is easy to defend on the perimeter leads to a low shooting percentage.
I understand your point about marginal benefit. I do not think we are in a regime where there is a marginal benefit to replacing a perimeter player with a big.