mrkapqa wrote: I am a bit confused by the wiki here as it says "Open Source Drivers"
https://wiki.debian.org/AtiHowTo
Does Debian not allow to include such "Open Source Drivers" ?
These drivers are open source, while firmwares are not. So Debian ship drivers (for which code is available), while for firmwares (for which code is not available) you need to do something about.
In this case it is enough to enable non-free repo and to install missing blobs... while you are there take a look, maybe you need something more from there
Like maybe CPU microcode updates, etc... these are also blobies and also not installed by default of course.
Like BIOS updates blobies for your mobo, optional sometimes not so maybe you want it maybe don't