Addendum: I see that discussing Lamport Timestamps would help replies.
This comes down to CRDTs need for there to be a deterministic, if often arbitrary, order to the edits/nodes making up the document.
If the edit is commutative CRDTs work fine! Otherwise Lampart Timestamps are *one* strategy for prioritizing edits. When time's sync'd imperfectly.
Each node tracks its understanding of all their peers' latest timestamp, to attach to their edits. That's a Lampart Timestamp!
4/3!