Plex by default is useless even as a local server when internet down

There’s already an existing suggestion thread focusing on this question.

See response by @darganbright56. This can already be achieved.

Many common clients will already cache session details for periods when Plex‘s backend cannot be reached. It’s probably a different topic for smart tv clients without persistence (e.g. app is reloaded from the internet on each run, authentication is required).

There’s already an existing suggestion addressing this request.

Please comment/vote in those existing threads to help us avoid distracting or cannibalizing votes.
Unless I’m missing some unique aspect of your suggestion, I’ll close this thread.