I'd be happy to run on arm or riscv if I can get high throughput and can expect Linux kernel support for a decade or so.
I don't know much about it but things like DBDC/MIMO are probably wanted. Other people may be able to comment more about this though.
I just went down the route of using a Banana Pi R3 with OpenWRT in the end though[2]. The R4 does exist now with Wifi 7 though[3].
[1] https://asiarf.com/product-category/wi-fi/wi-fi-module/wi-fi... [2] https://wiki.banana-pi.org/Banana_Pi_BPI-R3 [3] https://wiki.banana-pi.org/Banana_Pi_BPI-R4
If you don't want wifi6 or 5ghz support, it's easier.
(not affiliated, don't work for intel, have a bunch of other cards, most were a pain).