Both really need an explicit "Full/Partial" flag.

Over-polling is also a problem with both formats.

But the Local-First Fediverse is evolving. https://share.gemini.google/NHjiUHtpRTiJ

That's important and will break the walled gardens, and will change money flows I suspect as advertising revenue is more equitably shared with content providers, who themselves can be better paid for content produced and content promised. It's the 'ol centralization <> decentralization swinging back and forth again.