From the site:
With mission ctrl you can build your own dashboard widgets with blocks. You know blocks, the things you are already using on your posts/pages to make your WordPress site awesome.
I don’t use blocks on Initial Charge, instead composing everything in Ulysses and the publishing through Shortcuts. The contents of my entries are technical saved in Classic blocks, but I typically only ever interact with them using the code editor.
I do use blocks on other sites I publish, though — a personal site that I manage alongside a few family members and all the sites I interact with at my day job. The block editor is very powerful and letting you use blocks to add custom widgets to the WordPress dashboard is brilliant.