Yes, yes, 1,000x when it comes to the importance of simplicity. It's far too easy to unknowingly distract yourself and your users from what is important in your product.
My criticism is that this pays very little attention to how important it is to get to know who the people are you are attracting at the top of your funnel. It's tempting to reduce your acquisition funnel down to the level of "here's how many people we dumped in the top, and here is the % rate at which they activated." The truth is a lot more complicated. Too many people overlook this and optimize for what is working, which puts you at risk of unknowingly niching down into a small portion of your addressable market.