Yeah this was just a soft-launch for MWC. We're planning a proper launch soon with more context for the user, proper feature detection, categories, etc.
The goal is to get something decent on all browsers--and we'll open the repo on github for those who want to help us get there.
I don't think you understand how prefixes are used in the wild. Vendor prefixes re-inforce monoculture, they don't prevent it.