So let's assume you have a 2-tuner tablo. If you have channels 8-1,8-2,8-3, 10-1,10-2,10-3.
If you run a test on your tablo you might find that using the Live TV menu you can only record from any two whether it's a main channel, sub-channel, or different channel. The old resolve conflict menu.
But if you use the play button you can play 8-1,8-2,8-3 simultaneously on three different devices. But if you play 10-1 on one of the devices, 8-2 and 8-3 drop out of play mode.
If you are playing (Live TV) on 8-1 and 8-2 and then schedule to record the currently playing show on 10-1, then 8-2 drops out of play mode.
And when dealing with live play and the flashing red lights in the LIVE TV menu for what''s active, it's not always correct for sub-channels.
So what would or should a rational user plan for?