This is not a peer-to-peer comparison. The $199 HDHR is 4-tuner, two of which are ATSC 3.0. A 4-tuner HDHR model that is closer to the Tablo 4-tuner is $149. And a 2-tuner model is $109.
I have problems with that on Plex all the time. For example, if I’m recording a football game and try to start watching it in the middle, it’ll ask me if I want to watch live or watch from the beginning. Either way, the recording stops. This is with the Plex app on AppleTV.
Here’s another one: We often have the same local channel tuned for an extended period of time. The Plex app will suddenly stop showing the broadcast and jump back to the guide. It’s still on the same show in the guide, but if I select it, I just getting a spinning progress wheel. Sometimes, I can temporarily select a different channel, then go back to the original channel and it will work. Other times, I might be able to kill the Plex app and restart it, and then it will work. Other times (every couple of weeks), the Plex container on the NAS box (Synology) has died, in which case I have to delete the container from the NAS web interface, open an SSH connection to the NAS, and run a Docker command to recreate it.