I wouldn't care about the transparency on salaries and that type of thing, I think that has significant benefits. I wouldn't be willing to participate in the sleep sharing, or personal improvement tracking. I find that to be very creepy, unrelated to work, and intrusive. I don't find it that surprising given how much people overshare on social media though.
It would seem to me to open a huge can of worms to have to manage through. And then it would almost be a race-to-the-bottom in some ways: I make the same as Jake, but he gets in later and leaves earlier.
Not to mention, especially with hiring, there's very little room for negotiation, whether as a hiring manager or a potential employee. If someone is high-value, you run the risk of bringing in a new employee where (s)he is making a good bit more than the rest of the engineers, which could lead to the situation I mentioned above.