What problem does this address?

Users should be able to overrides more blocks that are can hold actual content, not just Paragraph/Heading/Image/Button

What is your proposed solution?

Some ideas:

• List Block > List Items
• Quote Block: citation
• Gallery > Image
• Verse
• Preformatted
• File
• Video
• Embed (and variations)
• Nested blocks inside: Group, Cover, Column, Media & Text