LastPass is a disaster, but in theory these benefits are true of Bitwarden as well. They say they encrypt the entire vault, no exceptions, and do the encryption entirely on device.

I can see the honeypot argument, but Dropbox is also a big honeypot for different reasons (tons and tons of plain text information that could be very valuable in the right hands). And I don't think finding the vaults would be as hard as you think it would, because searching for encrypted files should be relatively easy, and any encrypted file is probably worth attempting to crack.

I'm not trying to argue for cloud password managers, I'm totally open to being persuaded and would immediately switch if I were, but I'm really failing to see where the added security is versus Bitwarden. Bitwarden is open source just like KeePassX, so if it did not implement the security model that claims to I think someone would have blown a whistle by now.