Even though the 7800 is fantastic, it isn't perfect even after all this time.
The router you recommend has potential, but right now in early 2021 it isn't supported in a stable release yet. It's very beta. I'd love to see a new thread, to not hijack this one, with graphs like How to write a meaningful mt76 lag bug? - #16 by dana44 to see how the radio actually performs under pressure. Even the wrt3200acm is fine most of the time, but this test shows how well it can hold up.
Just run flent rrul -p all_scaled -l 60 -H netperf.bufferbloat.net -o run1.png once for the 2.4GHz radio and once again when connected to the 5GHz radio