[leksak]

Do ship fast until it is known what the application will even be and what the feature-set is and what needs the user actually has and not just what it is believed they need.

Don't sink a bunch of time into "cleanly" exploring the fog-of-war. Gather as much insight as possible as soon as possible. Only then will you be equipped to actually architect for the domain as it actually is rather than what you the developer think it might actually be.