About two years ago, Microsoft axed the entire MR devteam, and a few months back announced they will remove MR entirely in a future update to Windows.

I once had a Samsung Odyssey (not the +), and while the Quest 2 has a better screen resolution and much better controller tracking (and the 3 improves on both again), the Samsung's OLED displays have way better contrast ratios, which makes it much better when running games that have dark scenes.