Thanks for writing about this! Hopefully it will increase the number of community members providing feedback.

I did just want to point out one important clarification.

Themes released through the WordPress.org account via the Community Themes Initiative, like the recent Stacks slide deck theme, will NOT be officially supported, adding to the load.

While there is some overlap between the Community Themes Initiative and contributors to WordPress Core and other teams, this initiative is currently under the umbrella of the Themes team. It is maintained by the community on the respective GitHub repository, and they are not officially supported as a part of WordPress itself.

It’s possible that this may change in the future, but this initiative was started with the intent to improve the quality of block themes in the theme directory by increasing the number and variety of quality block themes available, serving as a reference for best practices and coding standards others can learn and build from, etc..

Because these themes are not intended for use as a default theme, there is a bit more flexibility to try new things and live on the bleeding edge instead of focusing on broad compatibility and serving as a foundation for a larger number of sites to build upon.