I've soured on the whole xxWRT embedded arm scene. It tends to break, probably due to power sagging during writes or just because it's low-margin consumer hardware that's meant to only last a few years, and then you're stuck digging through device-specific documentation on how to reinstall and reconfigure (or similarly to spec a new device).

My main router is now a Ryzen box run a common Linux distro. For wifi it's got Mikrotik R11e-2HnD (ath9k, 2.4Ghz) and Compex WLE900vx (ath10k, 5Ghz) minipcie cards driven by stock hostapd. Remote APs are lower power embedded amd64 boards that have the same wifi cards and also run Kodi to drive TVs. I'm not super reliant on wifi (wired is always superior for latency), but when the minipcie cards get long in the tooth for standards I'll just replace (or add to) them.

I'm sure the setup is suboptimal in some ways, but it fits right into my existing host configuration scheme and so requires much less attention than tinkering with oddball hardware.