I really enjoyed this article, but calling "being sales driven, not product driven" a mistake doesn't make any sense to me -- had they not made the call to be unit-economics-focused, they might have gotten into some product-perfecting rabbit hole and failed to generate the traction needed to actually keep their company afloat. This is something I notice in a lot of articles like this; they say "we should have done X instead" without acknowledging that doing X would have exposed you to a bunch of unknown unknowns, any one of which would have sunk you. I agree though that in general "make something that people love" is sage advice, but using the fact that your company succeeded, though not quite as quickly as you would have wished, as evidence for it just seems invalid.