Weeelll not for long. Open kernel module works like a charm for me. Wayland support is now actively worked on and is already functional for the most part. HDMI 2.1 was always supported while AMD would not be able to. HDR and 10 bit support also dropped just now.
How is NixOS going? I am also an Arch convert, but the issue with Gentoo is that it feels like a clusterfuck after days spent on configuration that is not easy to replicate. I mean it works but I might not want to go through it next time.