Reigstad said the theme will be “built for Full Site Editing first,” with as little CSS as possible, and all theme styles configurable through theme.json wherever possible, so users can edit them through Global Styles.
Of course WordPress would have to tempt me with an upcoming default theme! The tie in with 5.9 makes sense with the full site editing push. Still not sure what I make of WordPress’s direction. It’s surprising how page builders still seem prevalent despite the advances in Gutenberg.