The point of the experimental release track is so that people can try out new things even though it may not be fully stabilized (ie. still has bugs yet to be discovered and fixed, potentially very bad ones). Some bugs may not be easily discovered by internal or self testing, instead requires enough people have tried things out to show up. Some things related to user experience simply need exposure to enough people to accurately assess.
We keep those risky things out of the stable release track, so people who are less interested in the latest-and-maybe-not-so-greatest can still play and edit levels without worry that something bad may happen causing, say, lost of replay or corrupted levels (for an extreme example, though both have definitely happened).
You can in fact potentially use both versions at the same time for different things. For example, you may choose to do backroute fixes in an existing levelset you already released using the stable version, so the edited level will remain playable in stable versions and will not have risk of problems introduced by bugs in experimental version (even if you do backups, a crash that could wipe out hours of level editing is probably something you want to avoid). In the meantime, you may play around with throwaway levels on the experimental version to try out something new like a new skill or something. You may playtest an existing released level on the experimental version to verify it remains solvable and doesn't have new strange behaviors, and if you found any, you can report such bugs right away so they can get fixed, before the changes eventually get ported to the next stable-version release.
Also, some people may, from time to time, skip a version or two on the experimental release track if a particular version doesn't offer anything of interest (in the form of new features or critical bug fixes).
We've seen bugs getting discovered and fixed through people using experimental releases, so I'd say the system is working as intended. The poll seems unlikely to tell us anything that would change how we are managing releases.
Poll