I fully understand this take on the issue, mostly because it’s a good point indeed.
The things I’m arguing on relate on slightly specific use cases of Plex, such as non-tech savvy people (younger kids, the elderly etc…) who just can’t meddle in with different emails, passwords and so on, or maybe the PMS admin wanting to delegate to a close friend/relative the right to introduce others to the server (as they live in the same household/are trusted people).
Just as an example, I have my cousin ( who is pretty much tech-savvy) as a friend on Plex; he has a Plex account with email and password, and I invited this account in order for him to be able to fully access my PMS.
Now, he lives with my aunt, my grandma and my other cousin (non tech-savvy), and let’s say every of them wants their little space on Plex without passing through the relative complexity of creating an account and get invited by me.
I perfectly know that my cousin and my aunt, grandma and other cousin are in the same household, so when I granted access to my cousin I was perfectly aware that my content would have been at their disposal.
At this point my cousin, let’s say, creates a second user on his account for my aunt for her to watch a series he’s not interested in and doesn’t want on his Plex homepage.
Wouldn’t be awesome if, for instance, this new user had an option, or a button, to request me, the admin, the permissions to watch my content/see my libraries?
I would know that user is a part of my cousin’s account, who I trust, and I could decide if granting this new user the requested permissions or not, maybe after directly contacting my cousin in order to know if this is happening with his consent or not.
I know this message is way too long to illustrate a simple point, but I hope I deepened your knowledge on my target use cases for the features I’m asking for.
Waiting your response(s) as usual.