There's definitely a difference from an operational support standpoint. All of your configuration management for security and third-party tooling has to be rebuilt, you have to handle an entirely different set of patches, potentially some of your monitoring software has to be customized to support another OS, etc.

I don't think it's 2x the work to support two different distros, but it's definitely additional overhead that people may not necessarily want to deal with in order to play with something shiny and new.