Hi again, thank you for replying!
Please see Ari’s messages. Shared playlists appearing in the shared library is cumbersome at best (for a non-techie it is confusing having playlists appear in multiple places), and depending on the Plex client the Shared library does not even appear, making it not usable at all. I can see the Shared library on the Web App, cannot see it on the Windows app, and can see it on iOS. I have an Nvidia Shield TV but haven’t tested it. Ari mentioned FireTV not including it.
Shared playlists only appearing in the shared library is inconsistent with the way the rest of the media is presented.
My admin user has shared all media content to my managed user. If I open the Shared library on my managed user, I can see all movies, TV shows, and music. Those things also appear outside of the Shared library in my standard movie, TV, and music libraries.
So in my Shared library I have both media I can’t edit (can’t change metadata, etc., only the admin user can) and I also have shared playlists that I can’t edit.
Outside of my Shared library, I have all of my other libraries with media I can’t edit, but shared playlists I can’t edit aren’t there. It’s inconsistent. The media I can’t edit simply doesn’t provide an edit button.
Admin user:

Managed:

Why not just consolidate the playlists into the user’s playlist library, and if we don’t have the means to edit it, just don’t let us edit it? Like Ari said, just give it a lock item. Or a single line of text at the top that says (Shared). An entirely separate part of the UI just won’t be found by the kind of user that doesn’t explore technology.
Another idea: have two sections in the playlist library, Playlists and Shared Playlists that you can select like tabs at the top, just like how media libraries present “Recommended” and “Library”
For this one I mean the feature literally does not exist if you are a managed user.
If you enter a playlist on an unmanaged/admin user this is the hamburger menu. You can share the playlist.

If you do the same on a managed user, you are unable to share a playlist you created because the option is not available, even if all users can access all of the media that would go in the playlist.

Since everyone in the household uses managed users this means my wife can’t make a playlist and share it with me, she’d have to tell me what to put in a playlist, I make it in the admin user, then share it with both of us. My kids can’t make a playlist and share it with each other.