They are all great at open three point shooting though, and all are willing passers. This isn't like getting DeRozan, who can't shoot outside and doesn't play off the ball. Beal's best years came playing off the ball with John Wall.
I think Durant, Booker and Beal would be a nightmare for defenses. My only hangup in trading for Beal is depth (but depth was always going to be an issue after the KD trade) and health. That is the real hangup. What are the odds that Durant, Beal and Booker all stay healthy throughout a playoff run? Not good. Booker has missed a fair amount of time and KD makes Booker look healthy, meanwhile Beal makes KD look like an iron man.
But, given our assets, if Beal can actually be had for Paul and Shamet, you cannot pass up on it. Paul, when he is Chris Paul, is a better player than Beal has ever been, but Paul is so rarely that guy anymore and Beal is pretty damn good any time he is healthy.