Obviously, we’d love a new library type optimized for audiobooks, which would also handle the metadata nicely. But as a starting point, I’d be happy even if Plex just added a setting to not end a track until it’s at 100% completion and the ability to remember which track I’m on in the album. You already can remember where I am in the track, but I don’t want to have to remember which track I’m on. If those 2 things were added to the music library type, I could use Plex for audiobooks. But because those things are missing, I am forced to look for other options. I imagine those 2 things would not be very hard or time consuming to add.

EDIT - Oh and playback speed options are also a must for me. I usually listen at 2-2.5x speed. I guess the lack of those 3 things is what forces me to look elsewhere.