Why the Lakers do this: The Lakers get a starting-caliber PG- something they don't really have on their roster. Plus Smart can defend guards- another attribute they don't really have on their roster. They also get Jerami Grant for some shooting and size as an upgrade from Rui.

Why the Grizzlies do this: The Grizzlies get some shooting with size in role players who fit their timeline better and can also defend (unlike Kennard). Duop Reath fortifies their center depth- the Grizzlies have a solid center rotation as it is, but Edey has dealt with a couple injuries and I'm not sure how the center rotation will hold up in the playoffs, so Reath provides some insurance. They also take a (somewhat pricey) flyer on Jarred Vanderbilt. I personally love the way he plays and I think he would fit incredibly well on the Grizzlies when he gets healthy cause he's a dog defensively and the Grizzlies have enough quality depth that they wouldn't need to rely on him to play many minutes coming back from injury. And if he doesn't work out or stay healthy, at the very least, he's a tradable contract down the line. Also, underrated aspect of the trade, but Rui Hachimura and Yuki Kawamura are the only Japanese players currently in the NBA, so Yuki would have someone to help bring him along and get him more engrained in the NBA/team culture and hopefully help him reach his full potential.

Why the Trailblazers do this: For draft capital of course. They also take a flyer on Jalen Hood-Schifino, a young guy with some potential who they could probably keep on a low long-term contract in free agency this summer. I could see another second or some second round pick swaps being sent their way in this trade as well.

I really think this is fair all around, but let me know if y'all disagree.