For Quest 3 specifically, "remote desktop into a computer" actually works surprisingly well if you 1) avoid the stock Meta software and use Steam Link instead, and 2) use wired connection to maximize bandwidth and minimize latency.
The second part needs some explaining. One undocumented feature of Quest 3 is that it supports (some) USB-C Ethernet adapters. There isn't really any UI for it that I know of; things just work so long as DHCP is there. This then gives you a direct wired 1GBps link to the PC, which Steam Link will happily utilize.
I have xreal glasses and a Quest 3. There's so much friction in using Steam Link/Quest Link/Virtual Desktop that it's barely worth using over the xreal airs. You need to use controllers to turn them on, and if you lose tracking or exit your guardian, the display turns off and you have to grab your controllers again to make any adjustments.
I agree; I use Goovis G3 Max myself when I need this kind of thing (which is bulkier and not AR, but has better FOV and higher resolution). But for people who already have a Quest 3, it can still be a useful trick sometimes.
Imo a good WAP connected directly to your computer works just as well as with a high end cable. I have both and didn't notice a quality difference either way.
The second part needs some explaining. One undocumented feature of Quest 3 is that it supports (some) USB-C Ethernet adapters. There isn't really any UI for it that I know of; things just work so long as DHCP is there. This then gives you a direct wired 1GBps link to the PC, which Steam Link will happily utilize.