Ref: #52757 (comment)

…review the top 20 Headstart annotations for "how editable the output is". For example, Coutoire is just way too long to use as a template. Separating the issues of matching the demo from the quality of the demo as a template?

Known likely tasks …

• Work theme by theme with top 20 themes
• Switch test site to theme with homepage setup selected
• Review length of resulting home page in Editor
• Review depth of nested blocks
• Click on every block, look for weirdness, and "how do you know"-moments
• Update demo site and theme showcase assets if necessary
• Re-gen Headstart annotations

Notes: There'll be some art to some of this. Good task for dev/design combos like @sixhours @ianstewart and non-dev Design Selection Pod members who have cycles to chip in.

Potential future task when this issue is wrapped: All themes.