This is how it looks like for me: 
Or should we get rid of the "nostr:" prefix requirement and then no one will ever be able to refer to an nevent code ever again without it necessarily becoming an embed in the future?
nostr:npub1n0sturny6w9zn2wwexju3m6asu7zh7jnv2jt2kx6tlmfhs7thq0qnflahe would it be troublesome or hard to prepend a "nostr:" to these Nostr URIs so they render correctly for everybody?
This is how it looks like for me: 
Or should we get rid of the "nostr:" prefix requirement and then no one will ever be able to refer to an nevent code ever again without it necessarily becoming an embed in the future?
Could be my user error, I did copy the note ID by itself to share, however it does render properly on Nostur app. I’m no dev 🫡
Here’s how it looks for me

Well, yes. I think if Nostur is rendering it like that then it should assume that your intention was to create an embed and prepend the "nostr:" on your behalf.