I think there is also a practical desire to have something for people to link to eg along side:
#m=image%2Fjpeg&dim=804x345&blurhash=ZeQmCrt7%7EqRjayWBRjj%5BM%7BRjof%25MRjM%7BofRjxu%25MD%25of%25MWBRjayWBofofD%25of%25MayofWBWBWBRj&x=bafa753dede778eb3a04e9b88e5956ba2213e29606d02c8fe152fbf06ef0b731
But it is confusing that nostr is not whatever is being linked to, it will more than likely just be a microblogging client on nostr. So you could have the client logo there instead? But perhaps that is confusing for someone just looking for a quick way to connect, and you want something universal and immediately identifiable? Maybe none of this matters tho ¯\_(ツ)_/¯ lol