Yup, it is a necessity in my view for manufacturers with both combo boxes and those purely DVB-T to standardise having an HD terrestrial tuner.
Be nice if the combo sat side products were to DVB-S2 too!
As you say 'time'.
Another impact is that newer TV's are arriving on the market with HD (terrestrial) tuners regardless, so that would impact availability of combo band products, since in time the requirement would almost be pointless, cept maybe for PVR versions.
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