It's not just about the Warriors. All the contending teams play the same binary strategy of basketball that centers offense around an outside/in gameplan to either generate 3s or layups/dunks (which are a result of the spacing from teams having to step out onto the perimeter more than ever before). In short, basketball is totally 3 point centric today. All offense basically starts from there.
Skills have broken the game precisely because of that defensive strictness on the perimeter. Modern NBA perimeter players fueled by analytics have figured out how to exploit it to the maximum. And since the 3 is worth 50 percent more points, there's no reason to heavily focus your skillset and gameplan anywhere else. Sure, it always help to have a couple of post-plays and a good midrange shooter to throw in a curveball now and then, but teams are primarily looking three, three, three and then layup if the lanes are there.
For example, the end game execution in the Warriors/Rockets game last night was comical. 1 point game at the 5:39 minute mark and both teams proceeded to shoot a combined 8 three point attempts from then on. At that point in the game, points are more important than PPP. You just want a lead to maintain pressure, and shouldn't be worried at this point that a 3 made 40 percent of the time is worth more than a 2 made 50 percent of the time. The plan should be to get the highest percentage shots possible. Thompson, for instance, shot a terrible contested corner 3 with 5:24 left down 1. Just ugly basketball. This is how obsessed the league is with the 3. I switched the game at that point

. It really does feel like watching rec league.