IMO Filenames being readable is not really a downside. How else would you recognize which passwords you need? In any other password manager you have a reference, when using pass you simple have a directory of encrypted files with a simple interface for access. I store them under lock and passphrase, a 4096bit rsa or ed25519 key, which is on an encrypted hard drive, and only accessible by a password protected user or root.

It's Unix Philosophy at it's purest, and the reason why I use it for my password management.