You’ve answered your own question. It’s a PC laptop with a full fat processor and GPU. Certain x86 chips which have super low power states still don’t make use of it because of the billion softwares there may be installed which keep the processor from entering that state. Then there’s the motherboard issue. Not all of them support such states. Here’s a video from Wolfgang, it’s for PCs but the same applies for laptops.
The first Android phone in our family was my mother’s Samsung Galaxy Ace. And naturally, I’ve used that phone more than she did. As a kid I considered that swipe keyboard as mankind’s greatest achievement. I would send lengthy SMS to friends and family because typing was suddenly so easy.