Satoshi Nakamoto's anonymity have been Bitcoin's greatest strength and wether it was an intentional move or not, I believe the creator(s) already understands the inexplicable importance of such decision and already knows the extent of failure( damage) the coin will suffer if he decides to unveil himself. With these points of mine, I hope I've succeeded to convince you why Satoshi Nakamoto is very likely to remain anonymous till the end of time.
I don't know whether Satoshi is dead or he intentionally disappeared. The first version seems to be the most logical explanation to his anonymous identity but in the second case, I am sure that it's impossible for an alive person to remain anonymous for such a long time, especially after such a huge success but his disappearance is what makes Bitcoin the number one currency to my mind. His disappearance makes Bitcoin truly decentralized currency and also the massive adoption of Bitcoin worldwide, strengthens its decentralized value further.
Anyways, I think we all thank Satoshi for giving us Bitcoin and for ensuring the anonymity of his identity.
OP, your stated beneficial factors are well-written.