Except that Intel still doesn't make a graphics chip worth anything when it comes to running 3D games like Fortnight. And AMD opensource drivers are far from having nVidia-like feature and capabilitiy parity with their Windwos counterparts. Sadly.
What is missing from AMD's drivers? They are great now IME, I'm using them to play games. (Note I have older GCN hardware - there seem to be more bugs with more recent hardware where they are still making bigger changes)