How about adding a NIP with a list of the golden standard NIPs we consider to be a basic Client?

Aka. If you want to build a client in a weekend: only focus on these.

I certainly agree that webbrowsers have become bloated. And it affects their UX performance, but as nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s implies the w3 standards are so complex that even if open they are a barrier of entry for free experimentation.