Don't put a bad restaurant review on yelp if you don't know how to cook. I understand that the difference here is that the reviewer is also a dev, but it does not change much since he put this up as a user.
It's the difference of saying that a restaurant makes bad food when you're a bad cook, versus saying a restaurant shouldn't be vegan-only because as a crappy cook, you want people to be omnivores. It wasn't a critique of Mailbox as an app (which the author actually seems to like), but a critique of the choices Mailbox made.
