when i found dan's blog on github, it was like i was hooked from that point on. Part of the thing about humans is that we expect geniuses to act a certain way and when they don't we get upset. Dan didn't explain why he was leaving Steemit, but I believe he follows the inventor's way, more than the businessman's way. Inventors get stimulated by creating NEW things, not fine-tuning their existing inventions. When we understand this basic nature of Dan, it's easier to accept him as a human being. He doesn't explain this himself, so I have come to this conclusion (based on seeing his work, but not being directly in communication with him). 
I am just guessing, so therefore, none of this is fact-based. It's based on assumptions. But most business-minded people would have stayed with their product, like BitShares, instead of moving on to create Steem and then EOS. I think that Dan must create new things constantly in order to satisfy his restless and idiosyncratic mind that very few people can even remotely comprehend. And I think those who do, are similarly not really into communcation........at least not simplification of complex ideas. I have a very strong urge to understand everything that crosses my path, and Dan is one that continues to elude me. Elusive targets are the most desirable, at least to me, and if I am destined to be trapped inside a life of social isolation, then the least I can do is try to understand things that elude most of humanity.