The Final was between the Cleveland Cavaliers, who finished 3rd in three-point attempts at 29.6 a game, and the Golden State Warriors, whose 31.6 attempts a game, led the league. Because these two were in the top three in attempts and met in 4 straight finals, many concluded that this was the secret to success. And thus, the myth was developed,
Well, that was a classic case of misinterpretation.
It turns out the Warriors were not seeking to lead the league in three-point attempts. They were trying to reach a sweet spot; it just happened to be an amount that led the NBA in three-pointers.
It's why while the league kept chucking up more and more threes a game, the Warriors held steady to the point where they had fallen from first in attempts in 2015-16 all the way to 17th in attempts during their 2017-18 championship.
That leads to the point where we're at now, where the 31.6 three-pointers a game the Warriors led the NBA with in 2015-16, amidst their five straight finals appearances, would have ranked 23rd in the league last season, an astonishing increase in league-wide three-point attempts in just four years.