I like SystemMenu. It would be a shame if Roblox were to tell me in no uncertain terms “lolscrub ur usin da RibbonBar keke, no arguing” by disallowing its use.
Allow it to be used in production studio, but don’t bother updating it (preferred) (remember, revisions don’t write themselves)
Create a standalone version of the last studio version that has SystemMenu capability (acceptable)
This isn’t a discussion on “facts” about the two UI nor is it a discussion on opinions about the two UI, and lets keep it that way.