What problem does this address?

The handbook documentation mentions wp-now to run an environment locally. This package will be deprecated soon; the new CLI @wp-playground/cli is the tool that is receiving the most recent improvements from the playground Team.

Interactivity API quick start guide: https://developer.wordpress.org/block-editor/reference-guides/interactivity-api/iapi-quick-start-guide/
Block Development Environment: https://developer.wordpress.org/block-editor/getting-started/devenv/

What is your proposed solution?

Update the mentioned pages to the recommended CLI.