I don't remember any restriction in NIP-01, so I would safely remove it.

Display name has always been controversial, actually it does not make much sense, in fact I didn't include it in Nstart.

A lot of clients also started to deprecate/remove it.

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NIP-01 suggests kind 0 for metadata. Do whatever you want to do, but for social media clients it’s stringified JSON with some conventions.

I am always in favor of removing stuff — not that I have a say

There was definitely a restriction in the early days