I've repeated that last point because I find that the difference between shot performance in between the mid range zones is not significant compared to the difference between the mid range shots and other avenues of scoring. If you really need more detail as to why there's an emphasis on those three other areas, I don't honestly know what to tell ya at this point. Those three areas of the court are far more efficient and those are the shots that offenses are trying to create and defenses are trying to take away. Forgive me if I thought it was trivial as to why the three most efficient areas of the court which comprise of the large majority of offense are the most important. Like I said, there is certainly value to be gained in the other areas, but it's not something I would focus on.
What else is lacking detail, I'm happy to explain?
I guess we can start with the capital T Tradeoff. Just from watching basketball, I find it clear that when a team takes more shots from floater range, it usually means it's because there a defender between them and the basket (I already said this). But if you want a different perspective, you can look at the math. What is the (pearson) correlation of 3-10 shots allowed compared to other zones:
Rim: -.75
10-16: 0.06
16-3fg: 0.21
3fg: -0.29
So as you can see, there is not a strong correlation between the amount of shots allowed from 3-10 and 10-16 or 16-3fg. In other words, the amount of shots allowed from 3-10 does not seem to have an effect of shots allowed from further away. However, there is a strong negative correlation with shots at the rim. You take more shots at the rim, you take less from floater and vice versa. Like I said in my first post, it's zero sum.