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Absolutely right.

There is no way that a Cortex-A series processor will be as efficient as the Cortex-M's microcontrollers that are being used by the Pebbles.

There is also nothing that needs the power of the Cortex-A's either, the M series are perfectly capable of doing everything a watch needs to.

They can increase battery life by making the watch bigger and heavier. Don't laugh -- okay, do laugh, but it's surprising what people will put up with. We used to think that 6" phones were ridiculous.

It's ridiculous because they were making them thinner too.

Some of us still do!

Yeah, on the Pebble Time Steel it lasts me 7-8 days. Before I activated health activity tracking, I'd get to the order of 9-10 days on average. I find this highly impressive.