IEEE 802.11 ax
When sorting out connectivity in the flat I didn't want VDSL — 30 Mbit through a modem is embarrassing. Wireless internet didn't work out in the end so I landed on a 5G modem. The box that O2 had custom-made doesn't offer much. More like nothing than a lot. Need multiple Wi-Fi networks? Change DNS? Not possible. But what it does do is WiFi 6. I was genuinely impressed. New iPhones and new laptops can connect and the speed is breathtaking. However, I needed more functionality. Given the size of the flat I was looking at something that supports mesh. I eventually tried AmpliFi, which also supports WiFi 6! Unfortunately I ran into the same issue of limited configuration options. The fallback was the Ubiquiti Dream Router — also with WiFi 6 support. When I measure performance it's almost 100 Mbit, which is what I have on the uplink.
Unfortunately you won't find support for this protocol anywhere other than tablets, phones, computers and presumably TVs. Fridges, washing machines and other smart gadgets can't do it yet — at least as far as I know. Hopefully that improves in the future. On the other hand, good old 2.4 GHz has the best penetration in the flat, so everything can connect. At 5 GHz the signal drops off quickly.