It's not a hypothesis though. This is nothing new. The only new element is Nostr 🤷‍♂️ I'm not arguing with you, so I hope it doesn't sound that way. Like I said, people can try it but it's not like this issue hasn't existed for years. Cross posting is intended to save time and increase reach. It ultimately does neither. Content needs to be repurposed for each specific platform. Tools like Hootsuite have been developed to help automate this to some degree, but it is still not as easy as write once and publish everywhere, no matter how much people wish it was that easy. Nostr will be no different. 

https://youtu.be/-U9lG009s1k?si=XUGXnnKhWkQ5I4Du