Multi-device access, browser integration, mobile platform integration, and sharing with spouse or team members. I know there are solutions to some of those based on some variant of KeePass, but using something like Bitwarden is very easy. Bitwarden is really nice in that you can host the server yourself (or use bitwarden-rs), so you're not having to mess around with WebDAV or some other storage sharing mechanism.
Though one more point that’s more than just "ease of use" is probably shared access. AFAIK Keepass has issues there while bitwarden (IIRC) supports it completely.