All great points. My only argument in the article was that it is just a tool which should be used if you specific case for using it. It isn't inherently bad, yo

All great points. My only argument in the article was that it is just a tool which should be used if you specific case for using it. It isn't inherently bad, you just need to see where it is a good fit. Like you said, design can be more than sum of its parts so doing thousands of tests for designing a new IDE (for instance) is impossible. Though if you have a specific question to answer: should I have toolbar instead of menu bar, then of course you can do A/B testing.