"At that volume (of shooting) you can not expect 40% for the season. When he does that is really exceeding expectations.I went through it, he is on the season, in 3-pt attempts per 100 possessions, Malik Beasley is 3rd in the NBA. It's Steph Curry, Duncan Robinson, Beasley, Bertans, and Jordan Clarkson. Of the top 5, the only player who has a better 3-pt percentage of that group is Steph Curry. Beasley is second best, 3rd in volume the league this season of those top players."
He was essentially saying that the other players in the league who are in this extreme mega shooter role, typically struggle hard to shoot a high percentage. The shots are difficult, it hard to get in a rhythm, you have to come out and be ready to gun. It's not the same role he plays in previous years where he was a starter and could flow more.
When you look at it like that, it makes the poor shooting a little more understandable. Also, the fact that he jacks so many shots isn't really because he's a shot jacker, it's his job on the team, to bomb away relentlessly. It's a hard role to fill and he will probably never be a really high percentage shooter for a whole season as long as he is playing this way.