AFAICT, it helps you pick an instance based on your interests, which only barely helps with the problem. If you’re new to the ecosystem, you typically just want to join in and see what’s going on before making any decisions. And you probably don’t want to bother with selecting criteria for a selection guide at all.
What I’m suggesting is clicking a button “Sign Up”, enter credentials, verify and done. Then allow the whole finding an instance process pan out naturally.
Part of the issue IMO is that how an instance advertises itself isn’t necessarily how it will be seen by someone … they need to see it for themselves.