My few experiences with RH support/engineering have been universally bad. Each time they basically said, well, that won't get fixed since the fix for that behavior wasn't patched until a later feature release.

Support means fuckall when they don't care or their timelines are measured in quarters and years. It's why when someone says "oh, you are paying for support" I just laugh at them. The tens of thousands of dollars we paid per year for RHEL would have been infinitely better utilized for supporting upstream projects and their developers.