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I don't understand the connection on why we need such an efficient chip for implementation in devices which are plugged in.

If the economic benefits were so strong for those devices being connected that should have already happened.

What am I missing?

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You really don't care as much when its got mains power but not all of these devices are plugged in. You will see them a lot in simple hand held consumer electronics like garage door openers, remote controllers, wireless mouses, kitchen timers and so on. In battery powered devices saving a mA make a world of difference.

mA may matter for something like a phone but really the war in the 8bit space is over uA and nA.

Many 8bit mcus end in places where their battery is expected to have a life time measured in years. Last I looked I think MicroChip is leading the way here in terms of sleep power. Their PIC XLP series only draws ~20nA while sleeping.

There is more competition in the 16bit space with the MSP430 from TI.

You seem to be missing that it is always a good idea to save power.

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