At least to my eyes, this looks like an incredibly flexible way of creating a formal definition of the state of all UI components and the corresponding flows be

At least to my eyes, this looks like an incredibly flexible way of creating a formal definition of the state of all UI components and the corresponding flows between the screens/components. https://sketch.systems/rgraves-aspiration/sketch/e85b70fd4ec153e7a22137b6070f00ef https://sketch.systems/rgraves-aspiration/sketch/e85b70fd4ec... Look at this for example. If you wanted to change the login flow to add signup with a third-party provider (oauth etc.) it'd be trivial to change the markdown.