Has anybody else experienced this issue on their S21 Ultra where their Wifi6 downloads are slower than normal? My upload seems fine, giving how far I sit from the router to test (speeds match laptop and other devices). I'm on symmetrical gigabit internet and my current router is set to Wifi6 on the 5GHz 4x4 band @ 160MHz (DFS) that sits alone on the channel that I've specified (pretty packed community, luckily there are many channels that are free to choose).
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Same issue here...600/300 ISP, WiFi 6 router and S21+, only download speeds are way lower than usual (380-550Mbps max, 650 only reached 2x times), upload gives me more than 400Mbps every time, this does not happen with my PC AX adapter, clearly WiFi will never be good as cable, maybe 5GHz band have a lot of interference, you should test your device with WiFi6E and a proper router.
You have one of the best routers available in the market... I've solved my problem and it was a router firmware issue, now I can get almost 900Mbps via WiFi6 with my S21+ and an Asus AX86U with my 900Mbps load balanced links.
Try the last FW from Asus and if not OK, you must try other/older releases.