Still doesn't make sense. It sounds like this is a "hack" to implement some functionality which exposes users' private data. What SHOULD happen is that vendors

Still doesn't make sense. It sounds like this is a "hack" to implement some functionality which exposes users' private data. What SHOULD happen is that vendors should expose better APIs which allow the password managers to do what they need to do without exposing the users' data. For example, if the implemented functionality is attempting to make a "temporarily store password in clipboard" feature and implementing it by "reading from clipboard/writing to clipboard/restore clipboard contents after N seconds", there should instead be an atomic "store data in clipboard temporarily" feature.