NOTE: I feel like I’ve seen this discussed before, but after a mind numbing number of searches I couldn’t find anything that exactly matches it… So I apologize if I’m creating a duplicate topic on the matter.
So now that we have page bundles and content sections it would be efficient if we could have our themes have this capabilities too. Themes already support layouts and section layouts so it seems natural that we should also be able to use the power of _index.md as a content section in a theme.