At home, my laptop appears to connect to my wifi, but it doesn't actually work. I've tried using a repeater, but that makes my phone jump randomly between networks (even when one is sitting right next to it).
Even in a best-case scenario, there's a wide area that's close enough to the AP to make a phone try to use wifi and not use the cellular network, but far enough that the wifi doesn't actually work. If you happen to be standing there, you'll just be disconnected, and drain the phone battery.
A friend used to connect his first-floor desktop to the DSL router on the ground floor, but after changing the router it's no longer working. None of these issues ever produce any useful error messages; most of the time it just declares to be working, except that everything times out.
By comparison, my cellphone's 4G always works, if it's in a place that's covered.
So, does this new AX standard actually, y'know, work?