I keep ignoring it because that's not what I said. I said he was less effective off the ball, not that he wasn't an efficient shooter on assisted shots. Curry is a better shooter on spot-up attempts (47 percent versus 40 percent from three). But in no way is he more effective without the ball. Curry has his gravity, running PnRs and such, and Martin has his foul-drawing. Martin's release also allows him to be run off the line more often, which is why he has more attempts at one- or two-dribble long twos (182 than he does threes with defenders within four feet of him (162). And at 37 percent on those long-twos (for the last six seasons, not just this year), it's not a good choice.
To put that into perspective, dribble happy Green has 21 contested threes to 13 dribble pull-up long-twos (and he's 47 percent on the threes). Patty actually is like Martin in that he has more long-twos than contested threes for his career (98 to 75), but Patty release allows him to not HAVE very many situations where he has to make that decision.
For the team, Martin being so damned inefficient from the right side limits how they can spot him up. He pretty much has to park on the left wing, which is already where Green and Mills like and where everyone but maybe Kawhi like to post up. Hammer plays are less effective, because it takes longer for his shot to become unblockable. The slide to the corner has that same issue. I don't think it's worth changing that many things for him, and if you add in the defense and playoff choking, I don't see why he gets 10-15 MPG.