On the topic of WPA3, I recently found that the old iPad 2 or 3 doesn't connect to wifi if it's set to WPA3+2, it only works in pure WPA2 mode. Tried on two different AP vendors, though I have no idea if they might use the same chip or driver or something. It's the only device that didn't work in this mode, everything else was fine, including some whacky iot devices like picture frames and an inverter.
Hm, in that post they say all of the 2.4ghz devices had the problem, while in my case it was just the iPad, and it was broken on both bands. But maybe it still was this (or a similar) issue. I only have access to one of the two APs right now, and there is pretty much nothing configurable regarding WiFi security apart from selecting from WPA1+2, WPA2 only, WPA2+3.
