It's more from a user perspective I think
Because GitHub.io looks a bit weird to normal people but .app or .social or something like that is okay
I think normal people doesn't mind domain.
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I think they do -- mainly when sharing
Also, for recall purposes, it's useful - everytime I want to tag rabbit website, I go to my browser & copy link. For Nostter now, I just type the url
They don't input (even know) URL.
(At least Japan)