Originally Posted by
Pelicanidae
The simple answer is that 3 points are better than 2 points and you have to be exceptionally great at shooting midrange shots to make it even approach the value of any given 3 point shot.
The longer answer is pretty complicated, but I'll do my best to explain it without writing 5000 words on it.
The absolute best thing you can do to understand why pretty much every team, not just us, prefers the 3 point shot to the long midrange is to watch this video:
It's a talk by Seth Partnow, who currently writes for The Athletic and used to be a member of the Milwaukee Bucks analytics department. It's a pretty interesting talk that basically outlines why the league has progressed the way it has in terms of shot selection. It essentially boils down to a few relatively simple points.
1) The best players in the NBA still take as many midrange shots as they ever have, with a few exceptions.
2) The players who are cutting midrangers out of their skillset are the roleplayers, who get fewer shot attempts and therefore need to have their attempts come from higher value areas if they're going to be justified.
3) 3 pointers are so much more valuable than 2 points, that you don't even have to be a league average 3pt shooter in order for your corner 3 to be more effective at creating points than a league-best midrange shooter taking a 20 footer.
4) Stretching defenses out to the 3pt line is super valuable and creates more interior space for drivers and ball-handlers.
Something which is a more recent development that Partnow doesn't really mention in this video, is the rise of ''heliocentrism'' as a concept in basketball. You can watch a pretty good, short video on the idea here:
Essentially, it comes down to the fact that best, most efficient offenses tend to rely around a kind of Mega-Creator, who has the ball in their hands the majority of the time that they're on the court and who masterminds the majority of the offense via their own offensive gravity and their ability to pass. The best way to maximise this is to follow the Lebron model: that is, have a ballhandler who is unstoppable at driving and surround them with shooters to pass to. The 3pt shooters open up the paint in a way that makes the driving easier, and the harder the ballhandler can drive, the easier it is for them to generate at-rim attempts (the most valuable field goal attempts in basketball) and the more options they have for passing out for threes (the second most valuable shots in basketball).
The only reasons you really have for taking long midrangers are the following:
1) You're one of the absolute best midrange shooters in the NBA. I'm talking prime Kevin Durant here: gotta be shooting pretty much 50% from midrange to make it generate more points than even a mediocre 3pt shooter taking a corner 3. This is incredibly rare, it's basically a handful of players in any given season who can do that on any real volume.
2) It's the only shot you're going to get: it's a broken play, or there's only 4 seconds left on the clock and you have no time to work for a better shot, something like that.
3) A couple of them throughout the game, just for variety and to stop the offense becoming predictable.
That's about it. If you're a roleplayer, and you ever find yourself working to get a 20 foot jumper with 20 seconds left on the clock, then there's something not quite right about your offense.