I envy the absorption in a creative activity and also the growth they experience in terms of their skills. Think about it - at this point this guy isn't just a great programmer, he is also an accomplished designer, artist, writer and musician. A true renaissance person.
I'm quite focused compared to many people and I don't waste a lot of time with social media, television, etc., but I'm nowhere near like this guy.
About four years ago I decided I wanted to learn a second language and I poured a lot of effort into learning Spanish over a three year period. I got to the point where I could carry on a conversation with a Spanish-speaking person quite naturally, read the news in Spanish, etc., but I never felt entirely fluent. Then things got busy and my attention shifted and now, a year after I was last really actively learning, I know my skills have deteriorated.
I want to get back into it but I'm struggling to find the motivation. It feels like work and I already work hard. And truthfully, it always felt like work, it's just that I really wanted the experience of understanding and being able to speak another language. I got to that point, but I don't feel like I took it far enough - and this seems true of so many things in my life. Pretty good programmer (at one point), decent enough entrepreneur, not a bad father, solid writer, crappy musician but having fun with it, kind of fit but not terribly so, etc. In short, jack of all trades, master of none.
I realize I'm rambling a bit, but to tie it back to where I began, obsession seems like a bit of a cognitive shortcut to me, a path to excellence that feels less like work and more like addiction. Is that true or am I just intellectually lazy? I want to dive into something, to find something that holds my attention raptly for the long term and generates true personal growth along the way, but I don't know what that would be, and in four decades of living on this planet I don't think I've ever come across anything that fits that bill.