Ultra-low power processors - why?

Question

Processors

I noticed that laptops with i3, i5 (4th generation) processors are now mostly with ultra-low consumption (specification "U"). Why is it needed? I absolutely do not need this ultra-low consumption, but finding a normal processor with a normal frequency has become a problem?
Maybe I'm not catching up with something, and the clock frequency ~ 1600 is normal?

Answer 1

It's a laptop, not a number grinder. The laptop needs to work for a long time, allowing its owner to edit documents in a cloud office suite while drinking coffee at the airport, while waiting for a flight.
All "capacity" now goes to the clouds. This is the trend.
I note that the clock speed in laptops is usually regulated over a wide range:
For example , ASUS UX2E with an i7 processor and a clock speed of 1800-2900.

Answer 2

Heat dissipation is less, battery life is longer. For compactness, you need to sacrifice something, you win in weight, battery life, but lose in frequencies.

Answer 3

Not only low consumption, but also reduced heating. Even the i5 3317U in the tablet is able to warm up to 90 C, heating even the glass of the screen noticeably. In laptops, of course, cooling will be better, but also without miracles.

Answer 4

because 8 hours of work for an ultrabook with a dual-core i5 and a weight of 860 grams is awesome.