re: Stripe, it feels like what was more important was that they understood that what they were working on truly _was_ a problem -- I don't think the point of the article is to say that you need to completely understand every nuance of the problem you're solving before you can move fast, but that there's a base level of understanding you need to have in order to be effective (which is probably less common in founders/startups than most people think) ¯\_(ツ)_/¯