How does Satoshi's anonymity affect the trust of users and investors in the Bitcoin network?
The disappearance of Satoshi has not affected the trust in Bitcoin one bit, it has rather caused more appreciation of the asset for it shows a true decentralisation and freedom in his absence. This has never been done before and more reason why people trust Bitcoin and adopt it this much.
Can this anonymity be considered an asset or a drawback for the legitimacy of the cryptocurrency?
For me, it is both, it's an asset because it shows true decentralization and freedom of people since Satoshi is not making sole decisions regarding Bitcoin. But it's a drawback because developers and miners are monopolizing Bictoin to their advantage. Also, Bitcoin needs some important upgrades, the abandonment by Satoshi is not helping, it's a setback if we think it through.