My stance has been that the NBA shifted drastically towards 3 pointers since we were last a decent defensive team, and we have never adequately adapted. A while back I went and looked and a shit ton of teams starting jacking up threes at an insane rate about 5 years ago. Started with Houston and Golden State and then just snowballed. Now all teams do it. And we have been absolutely ass at defending the three.
I'm curious about your claim so I'll look at some numbers; they will be highest avg 3ptFG's made -->.median avg made. I'll go back 10 years
2013-14 --> 9.5 --> 8.0
2014-15 --> 11.4 --> 7.8
2015-16 --> 13.1 --> 8.5
2016-17 --> 14.4 --> 9.3
2017-18 --> 15.3 --> 10.5
2018-19 --> 16.1 --> 11.3
2019-20 --> 15.6 --> 12.1
2020-21 --> 16.7 --> 12.8
2021-22 --> 14.8 --> 12.2
2022-23 --> 16.4 --> 11.8
ok...the first thing is after I got into it a bit I realized it would have been better if my first number had been the median between the 2nd & 3rd place teams in three's made. That's because more often than not, the team that led the league led by a significant margin over 2nd and 3rd. For instance, in 2018-19, Houston made 2.6 more three's than the 2nd place team, while that 2nd place team only had a 0.7 gap between 5th, and a 2.2 gap between 16th
so, I'd tend to put more stock in the median which I simply averaged between 15th and 16th. And you're right, in the eight years between 2013-14 and 2020-21, the conversion mark increased 60%. That's pretty significant, although the drop from 12.8 two years ago to 11.8 this year is curious
I'm thinking though that this may be off-point a bit. Since the NBA has become three-happy, to analyze properly you'd probably need to test a correlation between 3ptFG defense and playoff success
but with that in mind, if 3pt defense is more important, than the discussion about 2 shorter guards seems a bit misplaced. It would seem that perimeter defensive rotations and defensive schemes become more important than perimeter length. I'm not downgrading the importance of length because it is a factor, but I'd say closest defender was much more important than closest taller defender. It's more important to have a 6'3 guy 3 feet from the shooter than a 6'7 guy 6 feet from the defender. Very few three's get blocked anyway