tl;dr - it is not the default, it is the only one supported by Fedora and RHEL devs so they can focus on hardware support Good for them I guess, Red Hat have h

tl;dr - it is not the default, it is the only one supported by Fedora and RHEL devs so they can focus on hardware support Good for them I guess, Red Hat have historically done quite a lot in moving Linux forward, funding or employing a lot of the developers solving hard and sometimes 'unsexy' problems.