Thanks for kicking this off Praful!
I don’t think we’ll arrive at a standard set of rules for every possible situation. I suspect each feature will have its own reasons for being added in an experimental state, and therefore it would have its own reasons for when it would exit experimental. I think it’s fair for the community to ask for a feature to include why something qualifies as experimental, what are the criteria that needs to be met for it to be made stable and what are the criteria that needs to be met for it to be removed entirely.
One thing that could help those discussions along are guidelines for what are reasonable justifications for experiments and what are some example/plausible exit criteria.