The reality is most consumer motherboards rarely post updates especially after the first year or so. You'll tend to get updates to fix CPU compatability for newer CPUs if the motherboard is still on sale, but otherwise most long term BIOS updates seem largely to be from enterprise vendors (Dell, Lenovo, etc) and much less common on consumer or gaming type hardware.
I think most people rely on the operating system to (amazingly) hot patch it during boot. Intel and AMD both publish them and are integrated regularly into most distros (and the linux-firmware git tree). Surprising/weird that they haven't released the Renoir ones.
Also seems Tavis had a bug where Debian wasn't applying them on boot for one reason but didn't give details. Wonder what it was.
