The issue is that there is no alternative. I'm not aware of any distro with its base and all its packages working seamlessly with SELinux enabled.
Setting up SELinux in any other distro is, in my experience, an uphill battle. You need to become an SELinux expert to do so.
> The worst part about the packaging work is, the tools used to create RPM packages is showing its age.
Most people don't really create RPM packages, they just install them. And in this area dnf[1] is cutting edge: file-level dependency solver, delta-package downloading, parallel downloading, ...