RedHat has a bad habit of dropping support for things not because they need maintenance but because they're just old.

I once installed a Sun workstation with AMD processor (Athlon64?) and nForce (4?) chipset. The ethernet card was there but it didn't initialize, why? Because RedHat EOLd the kernel module. Why? Because.

Reinstalled the thing with Debian after fighting it for 30 minutes or so, and the thing worked happily ever since.