Yes, there are server limitations in nip 11 with all sorts of maxiums. Not sure if any relay is using it, or clients just Dont surface this. I think if you had a specific use case that required larger notes, you would write a nip for that specific use case and relays can list what nips they support, which is surfaced in client's and places like .watch

https://github.com/nostr-protocol/nips/blob/master/11.md

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Thank you!

It was added as an 'extension' to nip-11 but go-nostr at least doesn't define these fields yet. I certainly didn't know about it but it seems needed.

I'll PR it now (other than retention structure which I think is ill-defined).