Is Gruber a programmer? Why would it matter? I don't see how the user experience would be different for an app written in Haskell versus an app written

Is Gruber a programmer? Why would it matter? I don't see how the user experience would be different for an app written in Haskell versus an app written in Objective-C, except that the Haskell app will run faster and crash less (in general) I assume you wrote some apps for iPhone and did some benchmarking, right? "Platforms" have nothing to do with it This is where you are really wrong. Platforms and cross-platform development makes are huge difference in user experience. Take Android: if you try to target as many devices as possible you aim at the lowest common denominator. That means that more capable devices will provides lesser experience than they are capable of. Now if your tool allows to target Andorid and iPhone it gets even worse. Gruber's example with Kindle apps is spot on, it's ugliest app for Mac I've ever used.