I’m not sure about Hong Kong, but in Japan the allowable transmit power is much lower than the US. Anecdotally, I find 2.4Ghz is usually not usable due to so many networks coexisting but 5Ghz works well. Interior walls are mainly wooden though.
My complaint is about truth in advertising. Manufacturers should not be able to add the max speed of multiple networks and claim “5800Mbps combined speed”
Hard drive manufacturers advertise unrealistic speeds that can only be achieved in synthetic benchmarks. CPU manufacturers advertise CPU speeds that cannot be sustained under large load without dousing entire thing in liquid Nitrogen.
That's why you go and read benchmarks on the Internet, to see how the devices fare in more realistic conditions.
My complaint is about truth in advertising. Manufacturers should not be able to add the max speed of multiple networks and claim “5800Mbps combined speed”