Yeah, I think this ends up being a question of finding the right tools for the job, having them be accessible and easy to use, and supporting open source.
We have friends at Glitch and Repl.it and CodePen and are already starting to integrate in different concepts. Finding ways to collaborate in super aligned ways is not always the simplest thing to pull off but I think we're pretty aligned with the essence of what you're describing.
This was one interesting thing we've done and we would like to integrate more. The endgame is unclear, but we don't want to try and create sprawling universal tools that try to do everything.
Blogging is an extensible concept, and we definitely want to ultimately doing more exciting things on top of it.
Yes, taking the attitude of the early web where things were loosely connected is a good one. Having feeds that can be consumed. Web hooks. PubSub hooks, and rest / graphql apis would be another route to making bridges to other domains. I can write code in github and Netlify auto pushes a new site out via Hugo. I could see writing a blog post in Github/Gitlab and having it auto push to Dev.to , etc.
Good luck! The fate of the internet is in your hands. Free us from the social network black holes :)
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