I am most impressed with how much it just works. Make duplicate passwords? Just works. Share with multiple users? Duplicate key entries? Just works. Want to store or reorganize your DB, change encryption or share with someone else? Just works. Want to use it from your phone, your laptop, your server CLI? There’s probably an app, and it probably just works too.
It’s such a precious thing, a good DB design paired with good apps (KeepassXC is amazing). Not a lot of tools like that around.