VD people have outright said that at this time there is zero reason to upgrade to wifi 6 for it. You will not see any improvements over any other decent router.
Not
exactly, you have more bands available with higher end routers, so you can dedicate a certain band just to the Quest and get better performance. So for example you could use WiFi 6
only for the Quest 2, with a WiFi 6 router, and that would likely make a big difference. You could also keep your old router and dedicate one of your two routers exclusively to the Quest.
Generally faster routers have faster processors and are a bit smoother as well, though this difference probably only matters if you have other wireless traffic on your network at the same time as the Quest.