>Seriously if I'm buying a laptop one day and I'm finding out that there's no power cable in the box, I just bring it back and said that they made a mistake and forgot something.

There is a power cable, just not a long extension that also used to be.

>What about just stop buying those things?

What about we still want them, and we don't want to buy and suffer a subpar (for our criteria) alternative just to get them to be more generous with their profit margins...