And your solution is to do LESS TESTING? We don't know what we're doing, so let's cut back on the amount of data we can use to inform our decisions?
> "We are slaves to the numbers. We don’t operate around innovation. We only optimize."
I don't see why numbers should ever stop you from innovating. The difference between "innovating" and "optimizing" is just a difference of scale. You can make a huge change to your layout or site function and look at the numbers it the same way you'd look at a font and color change.
The quote above seems to say that people shouldn't make decisions based on numbers, and that's absurd for a company like Facebook. What should be the basis of their decisions then? Management's gut reaction? Whoever feels the strongest about a change wins?
Customer surveys and user metrics matter - both are often numbers. The real issue here isn't that Facebook uses numbers too much. If they made the wrong choice, it's because they put too much emphasis on the wrong numbers.