I am not sure why you are having problems. I use Plex for family video, Blu Rays, DVDs TV shows, Audio Book and Music rips, been doing it for years.
Never had a problem and I stream close to 20 devices, sometimes 10+ at a time.
Blu Rays are easy to rip and now 4k encryption has been cracked, 4k is harder but can be ripped with a little more preparation now.
My Plex resides on a Raspberry Pi with two external drives connected.
Don't have any issues.
What do you use to rip blueray?