In my experience major updates like this are discussed annually with eval, testing, and milestones set weeks and months apart. The transitions are often pushed a year or more when issues come up. Resources are dedicated to all of this.
It sounds like there are a lot of similar options with relatively easy transitions (away from Red Hat), but you still have to choose who you trust going forward and carryout the transition.
Sorry not sorry, but large outfits expecting to coast on a free offering don’t get sympathy from me.
That's why working at FB or Google is like going back in time as far as monitoring UIs, etc.
Some of the clever large companies took advantage of "site-wide support licenses." For example, Netflix paid MySQL AB $40,000/year for MySQL site support so they didn't have to hire any MySQL DBAs. Just keep filing support tickets. :)