This is a tracking issue to highlight the next big steps we can tackle to implement the original vision of the global styles (merge default, theme, and user styles) to improve both the developer experience and the performance.

Absorb the two big missing style pieces via the theme.json algorithm:

• Block styles: Use Global Styles or theme.json to style individual blocks #33977
• Style variations: Explore block style variations as packages of style attributes #33232

Performance:

• Do not output block styles for blocks that aren't used on the page: Theme.json: Block specific CSS is printed even if a block is not used on the current page #31642
• Track performance Track changes in the size of the global stylesheet #34329