Again, there is absolutely nothing that prevents this from being implemented in open source fashion. And this is a completely different use case from Fedi. This is basically extending the Unix philosophy to applications and it would put control in the hands of the user in how they want to interact with the app. For example, you could take a bunch of apps and make your own custom UI that leverages their functionality to solve a specific workflow you have. Try stepping out of your demagogy for a minute and actually think about this.