But it's not just PG, who at this point I doubt cares much about ROI, the work/balance debate has been going on since the dawn of time.

Every time after one of the surgeries I had, my main concern was not how long it would take to get back to work, but how long it would take to get back to training. And I don't get paid to work out, but I absolutely love it. I like looking good, feeling good, feeling capable. When I miss a workout, I feel guilty. The other guys at the gym show up once every 3 weeks and probably think I'm crazy. And I instinctively think they are slackers with no self-respect. But upon further reflection, I say that we are just different people.

And on the work side, some people like to work or be a part of something bigger than themselves (Apple, Steve Jobs, Coinbase!), or interestingly enough, just be busy with paperwork.

Good point, and it makes me wonder if it's just a personality thing. Some of the best people I know are never obsessed with anything, and try to maintain things in moderation, while I (and many others) find it easier to be obsessed and driven in a few things, often to the exclusion of other things.