The stock Mac UI is designed by Apple, the best designers in the world, and do you really think you can do better? Really?
The app world is full of people who think they’re better and they’re really, really, really not.
This is the same way I feel whenever I see a Porsche with a giant after-market spoiler on it. Do folks really think they can do better than Porsche?
He’s talking about Mac apps here, and I feel similarly about iOS apps.