Thoughts on Smart
1) His defense needs to improve. I know this sounds silly, but hear me out: Smart has elite defensive versatility but he doesn't have elite actual defense yet. i.e. He can guard 3.5 positions (1, 2, 3, and some 4 in an emergency) at a competent level, but I feel like the only players he's actually good at guarding 1:1 are bigger, physical ball-handlers (players in the Harden/Westbrook mold, to the extent that anyone can actually guard Harden or Westbrook.) He's still "just okay" at guarding super-fast point guards or bulky wings. No doubt his ceiling on defense is Tony Allen, but he needs a lot more work to actually get there.
2) His best skill right now is actually playmaking. We've all noticed at this point, but his passing is elite. If he was being given starter minutes and a higher usage rate, I'm pretty confident that he'd be putting up Elfrid Payton levels of assist numbers and we'd be drooling all over him as a prospect.
3) He still has all-star potential, but the key to that is finishing at the rim. His passing and vision are so good that his pick-and-rolls have to be respected, but they're a lot easier to deal with when the defenders can assume that he's not going to be able to get to the rim and finish at a reliable clip. If Smart becomes even an average finisher at the rim, he becomes a net plus on offense. Couple that with elite defense, and he's an all-star level starting PG.
4) As an extension to 3), his shooting matters less than we think it does. He's never going to be good enough at shooting threes that you have to respect the pull-up option, and even in his current ~30% state he's good enough and willing enough of a shooter that you can't just completely ignore him on off-ball catch-and-shoots. He is not an MKG/MCW level bad shooter, and given his expected role as a distributor, any marginal improvement in his shooting skills should be considered gravy.
TL;DR: Smart still has a narrow path to stardom, but it comes from doubling down on his strengths in defense and becoming a net positive on offense by consistently finishing at the rim. His shooting doesn't really matter that much.