Realtek RTL8720DN and RTL8721DM claim 5GHz wifi as well as 2.4GHz and BLE 5. Finding a decent dev-board for them is not easy. Seeedstudio's Wio Terminal is one of the few.

The ESP32 ecosystem, though, is much larger.

Yeah also waiting on that. They did mention 40mhz support, maybe that will help? In wifi congested spaces at the moment the AP mode is unusable..

Why would 40 MHz wide channels be /better/ if the spectrum is congested? Smaller channels would be beneficial. Let’s say 5 MHz, and with OFDMA that is what you get. This is why Wifi6 is crucial for the long term viability of 2.4 GHz WiFi.

WiFi 6 supports 5ghz

It also supports 6GHz, but that doesn't mean a specific radio supports all bands. This is a 2.4GHz-only part.

That is WiFi 6E

Yes, but 5GHz is not mandatory for WiFi 6.