The issue is centralization; a protocol is the definition of restrictions, constrains that enable interoperability. All protocols work like this, TCP, ICMP, IMAP and driving on a highway.

The more complex a protocol is the harder it becomes to implement it, thus the harder it becomes to remain interoperable and decentralized. 

 Wut?  Nothing in nostr prohibits an edit.  It fact, it's THE killer feature.  Not everyone has realized it yet, but it's good that some are starting to.