Hi Justin, I would like to highlight the fact that instead of making new feature request, the FSE should first include things which are already available in standard WP and should be a part of FSE.
It is really troubling to see that we are not addressing the Elephant in the room.
Following are my observations :

You can not add templates for Custom post type
You can not add templates for Custom Taxonomies

Further more , these high value tickets are currently open with no end in sight. The FSE is not flexible enough to accomodate more templates and the criteria for application. I really do want to support FSE but currently we are back to WP version 1.0 with no Custom templates.