I don’t know how the other companies are doing it but Eero Pro models have three radios so you should be at full duplex all the time. You can always put them all on Ethernet for true stability but they’re no slouch just using WiFi.
In this tier of product, the 3rd radio serves as a dedicated wifi backhaul channel which means the backhaul traffic doesn't have to compete for available bandwidth with your client devices but ALL wifi is half duplex. Even wifi 6 won't change that. In installations where the mesh satellites cannot be connected via wired Ethernet this is a great feature nonetheless.