[upofadown]

This is ultimately a usability issue. The Signal app has a feature called sealed sender. The assumption is that a feature actually does what it is intended to do. Signal makes no effort to inform the user about the limitations of this feature. My experience is that almost all Signal users that actually know about sealed sender think that it actually provides some practical benefit. Users that do not know the limitation of a tool are unlikely to use that tool properly.

This sort of thing is depressingly common in the world of encrypted messaging. It is really common for a user to not know about the requirement to do identity verification with E2EE for example.