Bandwidth - which in the UK will come when the analogue signal is switched off - needs to be freed up by regulators and manufacturers have to provide phones that can cope with TV viewing alongside the myriad other functions already eating upbattery life.
The light weight comes thanks, in part, to the fact that the company didn't beef up the battery, instead offering up some software bumps it says compensate for the additional battery drain that comes with things like a revved-up display.