I rarely (never) need to record one programme and watch another at the same time.
However, I have had plenty of failed recordings "time missed"... where I guess I must have scheduled
one recording at (or during) the same time as another on a different channel (MUX).
Having a second tuner would eliminate that, because when I look at the guide for the
week, and select my recordings ... TVH doesn't tell me that there's an overlap.
It would be a bit of a pain to have to double-check each scheduled recording in-case it's on a
different MUX in the same time period.
For this reason, I'll probably go for second tuner (OSMC, of course