Yeah, the "happy path" here is applicable if you don't attempt to install janky/poorly maintained proprietary out of tree drivers. The reason these drivers are out of tree is usually due to either serious hardware flaws, incompetent/inept vendors, or a combination of both. AMD has (in large part) fixed this by reusing the kernel shim from AMDGPU (open source & mainlined in kernel) for their proprietary driver (AMDGPU-Pro).

Nvidia meanwhile has stated they will not support Wayland, and has sandbagged the integration of their Linux Kernel patches for their single board computers (like the ones that are used in Tesla's cars). They don't give a fuck if their clients are stuck on broken, insecure BSPs, and frankly they operate as a malicious vendor: https://www.theregister.co.uk/2018/01/03/nvidia_server_gpus/