What functionality is missing? What is unsatisfying with the current situation?

On worlds with multiple authors, if I want to create a block template for use throughout the world, only I can create blocks with said template unless one of the other authors purchases a Sage tier subscription and copies my template code.  

How does this feature request address the current situation?

Add the ability to share block templates (and maybe other types of templates) with all authors of a world, perhaps by having an option to add a created template to the world itself such that other authors can create blocks with it.   Currently, it seems a large majority of subscription features are shared with world authors so long as the world owner has said subscription, and the current state of template shareability heavily goes against this.

As an example, I have a world that is a community project worked on by a handful of other people, I worked on making some custom block templates for use within the world for spells, and other things, but then found out I was the only person who could use said templates and the only workaround was for each author to purchase a subscription and directly copy my template.