Washington pivots from Kuzma as their best player, and looks to rebuild. Stewart and Fournier give them two solid rotation pieces, with Stewart on a team friendly deal for several years, and Fournier's expiring contract next summer. So they gain financial flexibility. But this is about the two picks, and rebooting the franchise with the #1-5 overall pick this summer.
Detroit doesn't have a ton of options. But after the trade, they can sign Tobias Harris for the other wing/front court position. A rotation of Cade, Ivy, Kuzma, Tobias and Duren, with Thompson, Grimes, Sasser and Wiseman off the bench, has a puncher's chance of making the playoffs. Without going into heavy debt for a big swing like Bradley Beal or Zach Lavine. They'd also retain their draft pick this summer, which will also fall between #1-5.