I think the more relevant stat is:
The Celtics are 22-7 in games in which all 5 of IT+AB+JC+AH+AJ have started.
When our starting 5 are healthy, that puts MS in his proper role of first bench PG, typically with at least 1 or 2 shooters from the starting lineup and guys who can shoot like Kelly, Jonas & Jaylen around him. And facing bench units.
I am thinking of this as well. You have to consider what factors into Smart taking 10+ shots a game. I love Smart and certainly a little bit bias but you have to think when he is shooting that high, the chances one of AB or IT is out that game or for a long period of time. Though I still like the idea of him being a "power guard" lol. I do see his 3 improving, not by much but somewhat noticeable, I am also seeing him drive more than last year and doing more floaters, but loving how Stevens is using him for post more. But I absolutely agree, with our starting 5 healthy and Smart off the bench, it does lower his shot and explains the extra shots he's taken when people are out with an injury. Surely I am wishing and hoping he makes a big offensive leap next year. I think a 20/5/5 Smart is definitely an all-star, if you consider his defense intensity as well. But I am content as is, as he is a major part of our team, and if it isn't a package deal for a superstar, I wouldn't even consider trading him
His 3PT shot is improving. Not yet by results. But it is by form. His form as of last summer has been changed from the horrid clam-shell that he used to exhibit. That bad form was never, ever going to become a consistent, reliable 3PT shot. As of last summer, he has a much more upright stance, keeping his spine vertical and using his legs to get the power into the shot. It will take a year or two before that feels 'natural' to him, but this is a much, much better shooting form than the crap he was allowed to use before. His coaches at Oklahoma should be ashamed for not fixing this. Improved results will also take a couple of years to show up. But they should, eventually. This form should result in a much more consistent shot since his upper body will no longer be moving haphazardly back and forth like it was before.
I don't think Smart will ever become a great 3PT shooter. He's not going to be posting a 3PT% near 40% any time soon. But he should be able to become at least a reliably efficient one. He should settle somewhere in the 33-36% range. And that should be just fine.