There are too many 'responsible adults' wallowing in mediocrity who more than anything else actually drag the system down. Maybe you can look up to them as role models on how to raise a family (although I personally would disagree as the majority fail at that anyway)... but how to leave a mark on this world and push for excellence, I will look to people like Steve, Musk, Frank Lloyd Wright, Edison/Tesla, etc. Please don't conflate the two.
Edit: I should qualify this a bit more. If it does make you happy to basically have no life outside of a career, then go for it. Everyone's happiness is something only they can answer for themselves. Some people can tolerate being lonely, and I'm pretty sure Steve Jobs was a lonely person (after reading the Isaacson book), despite having people around him.
You forget that even the "Canadian" one, Shuster, spent his life from the age 9 on in America and both were US citizens and did all their work in the US.
The key is not the childishness. The key is that he cared about important things in the context of making and delivering a great product.
I've played at a number of Irish Traditional sessions around the country. In one town I lived, there was a very bad drummer who was there every week without fail. No one would say anything out of politeness. After about a half a year, I took it on myself to say something, not in a mean but in a matter of fact way. Her ego was bruised, but on doing that several other musicians immediately thanked me. It seems that everyone there prioritized politeness over the level of musicianship possible, even though they knew it compromised quality.
I think it's entirely possible to change one's priorities without being mean or childish, even to the extent of inverting socially accepted priority orderings. Not everyone is going to appreciate what you're doing, but if your heart is in the right place, and you are behaving constructively towards your craft, your customers may well appreciate you.
(As much as possible, leave out the childishness.)
EDIT: You can also invert this -- let emotional baggage leak into your "concern for craft" and your behavior will very much be counted against you.
The lesson is that design details do matter, and when you pay attention to them it has a cumulative effect that results in a much better product. You do have to develop a certain amount of callousness to pursue your vision. You don't have to scream and berate people, but when you're sending a design back for the tenth time, you're bound to start thinking "Gosh, this designer is going to think I'm an asshole." A lot of people will just accept something that's not exactly what they want just to avoid potential bad feelings from someone else.
The emotional aspect made it easy and natural for Steve to pursue the design until it was exactly what he wanted. Indeed, it probably made it nearly impossible for him to do anything else. The rest of us have to consciously override social impulses that value getting along and being liked higher than small details. The upside is that we get to manage our response so we can motivate with something other than fear.
In many parts of Europe it's expected that grown men have emotional outbursts. Repressing them gives the impression of rigrid and cold humans which you should not trust.
To me part of being a grown up includes the ability to act with reason and tact under great distress. I've managed to do this once in my life when I was attacked by a good friend in a very harsh way because of complex reasons, and our friendship might have ended right at that point if I had let my emotions get the best of me.
I once had a boss who had an emotional breakdown almost every day at the office because things weren't going as he expected them to. He did not inspire me to do good work. He just instilled a fear in me that syphoned energy away and kept me from fully focusing on my work.
It was depressing, really. I will never know what Steve Jobs was like to work with, but I don't think I would have liked working for him, although he obviously got some good stuff out of his people.
Nobody is a perfect role model - everyone has faults. Is his attention to detail something we shouldn't forget? I think so. Is childish behavior the way to lead people? Not if it means tantrums and inappropriate responses - but then again, we may lose to much of the child in all of us when we hit the corporate world... there should be room for some playtime and wonder in the things we build.... nobody is perfect.
It's awfully hard to say a billionaire who made such an impact on people all over the place and died far too young isn't someone we should learn a bit about if we can, is it? (There are more out there than just Steve Jobs, of course... biographies exist. Jobs is just fascinating and current.)