AFAIK the proprietary drivers are mainly for professional use.
Also all(probably) AMD's gpus have a driver on linux.
I think what antenac wanted to ask is why linux doesn't have any of features that Radeon Settings have on windows.
Correct me if I'm wrong.
I was traying to install AMDGPU-Pro 16.4 and 17.4 version.
I have to say was impossible, both versions stop with errors and break up the system.
I am running Ubuntu 19.04