Remember Steve had very high standards. His relationship with his kids might not be what he wanted but I'm left with the impression that he was far more involved than many fathers. Reports of him attending school functions related to his kids come to mind.
Absolutely. When your kids are growing up, you are busy doing things together, being a family, parenting them, and taking an interest in your children's life. You aren't really trying to inform them about everything about you.
In their 20's and 30's you might like to share time discussing some events in your life, including events you are not proud of and lessons learned from them, answering the adult question they might put to you about events in your life.
Steve knew he would not be there for those adult conversations, that he just could not have now with his teenage daughters now (youngest is 13).
In no way does this indicate that he was not there for his kids, just that in typical Jobs fashion, he wanted to take it one step better and leave them a comprehensive supplement to understand their father after he was gone.
I would love to have anything like that from my father who is no longer here.
Edit: Steve Jobs the dad, from one of his Neighbors:
http://lisenstromberg.wordpress.com/2011/08/29/my-neighbor-steve-jobs/
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