Agreed, but some stick that are only compatible with windows/mac can also work in linux. I bought one 2 weeks ago, needed drivers to make it work.
This one is what i have and confirmed working:
This one is for Linux/Windows and mac
Why i have chosen for the "unsupported" wifi stick is because the speeds where much better. If you zoom in you see in picture 2 it only supports up to 300mbps. While the other one supports way more.