Satoshi making himself anonymous was one of the best moves he made. Satoshi was clearly very smart and calculated when it came to how he set everything up. By making himself anonymous and made sure that there was no "central figure" behind bitcoin. This was it didn't look like bitcoin had a CEO , so to speak. This kept bitcoin a coin truly of the people. This is kinda like why Charlie Lee sold most of his litecoin, so that there was a central figure over the coin holding large bags. I think this was a very smart move by satoshi personally.
This is a good way to reason on the disappearance of Satoshi. Perhaps he wanted real freedom which bitcoin gives and that is why no government has been able to stop bitcoin.
Or have we also thought that if Satoshi was made public or presented himself to the world as the founder of this financial revolution breezing everywhere, he might have been arrested by these security agencies all over the place, the likes of FBI, CIA etc and perhaps taken to ICC for an allegation of conscripting his own currency and maybe ending up in jail and the noble dream dies off. This is my loud thinking and most reasonable to be thought for whatever reason Satoshi went under is for the revolution to be achieved.