I remember watching a video from Linus demonstrating a WiFi router. I don’t remember if it was WiFi 6 or 7, but any obstacle could cause connection drops.

I don’t know if things have improved since then, but I usually bond WiFi and PowerLine for rooms that Ethernet cannot reach.

I used to run a Revolt server 3 years ago. The sound quality was beyond any other WebRTC service I had tried, but it was still in an early and it was lacking a lot of features. So, I switched to Element and Jitsi.

OpenWRT still relies on proprietary firmware for WiFi to work

WireGuard supports mesh as well, but it requires to manually configure all the keys and all the IPs on all devices.

There is wgsd, which supposedly makes WireGuard mesh networking easier, but I haven’t tried it.

Is this like Tailscale? Maybe closer to Headscale, as tinc seems to be completely self hosted.

I think the OP is looking for a decentralized alternative to something like Nord/Express/Mullvad to hide their traffic, and not a way to connect their devices together.