This theme does such a great job of selling a block editor-driven WordPress. It was a missed opportunity to not pair something of this quality with the block editor when WordPress 5.0 was released.

It's responsive! I'm amazed this stands out as a highlight for me, but, as the official theme, Twenty Twenty-One breaks in pretty basic ways in multiple places for different screen widths. I think this visual approach is also probably more approachable as "good design" for the average person than Twenty Twenty-One's attempt at a more typographical approach.

The amount of CSS served is a bit surprising: WordPress-bundled styles are 57KB, plus 122KB (90KB minified) for the theme. I continue to feel it's unfortunate core styles are bundled with WordPress, although I can understand many reasons for doing so.

Related question: for themes released via the Theme repository, is it a requirement for the native block styles to be used? More broadly, is it a requirement for all core blocks to remain available or can some be unregistered if the theme author chooses?