“There’s a lot of interest in reducing the number of workflows, and I’m hopeful that we can consolidate down to just one beautiful, intuitive interface,”

Amen to that. In my opinion try to build a hybrid / conversion / porting of Widgets and the integration / compatibility with FSE and site customizer has been a major mistake and has held back FSE development.

Let it go - Gutenberg content editor and SFE are the one beautiful, intuitive interface. Traditional themes will be around for a while but will fade out as the FSE takes over, as long as we get on with it and stop trying top build something that supports every single existing WP user and theme.

Sorry, I am frustrated by the continual delays in the development of the FSE.