How does Satoshi's anonymity affect the trust of users and investors in the Bitcoin network?
It is a plus, not a most important thing for value of Bitcoin. Because if Satoshi Nakamoto is still alive, and his or their identity is known, what will governments globally can do with Satoshi Nakamoto?
Almost nothing. They can not request Satoshi Nakamoto to halt Bitcoin blockchain, or make a network 51% attack, whatsoever. If you understand it, you will no longer be fearful about stories of Satoshi Nakamoto.
Can this anonymity be considered an asset or a drawback for the legitimacy of the cryptocurrency?
If there is anything like an assset or drawback, it's for Bitcoin, not cryptocurrency. Bitcoin is Bitcoin, as it is itself. Cryptocurrency is about altcoins, shitcoins, meme tokens, and personally I don't put them at a same level and importance of Bitcoin.