Today Notion is a last-write-wins system with limited intention-preserving operations for list data (like block ordering). Text is last-write-wins, each block text or property is a last-write-wins register. We're working on a new CRDT format for block text.
Do you use last-write-wins using the received order of operations on the server or using a logical clock?
I believe that for Notion the collaboration use case is more important than async editing, so a CRDT makes more sense, but for text editing apps that favor asynchronous collaboration maybe explicit conflict resolution is more reasonable.
