Well, it is not the same as what currently exist. or else you would not need to ask for it.
You've misunderstood. What exists today is that we have a single account for our plex usage, and any content that is shared with my account is available to anyone who fires up plex in my house- they're all logged in with my credentials to access my libraries, after all. what kiyose is asking for is that managed accounts be set up as a subset of the parent- filter down based on what that user accesses, rather than just what that user owns.
The alternate, to those of you who feel that this leads to over sharing of shared content, is to create a request mechanism so that the sharer can allow the sharee to allow access to managed account to, exactly as we do for syncing content from shared libraries. Either way this is a great idea.
