I'll take the flame-bait.

Tell that to all the companies running Linux for mission-critical services: Amazon, Google, Wikipedia, Slashdot, cripes, *most of the friggin' web*...

Your statement is about 10 years out of date, at least.

Well, RHEL also mantains a stable kABI within the entire major release, and only rebases packages when absolutely necessary (maintaining most library ABIs as well). For example, RHEL 4 ships apache 2.0.52, and has since launch. Security and bug fixes are backported, but the fundamental behavior remains the same for any instance of RHEL 4. This is also true of libraries.

This means that a given piece of 3rd-party software is more likely to keep working after an update in RHEL than in Fedora.