My old 3770K desktop from 2014, today: 
My laptop from 2017, today: 
this post was submitted on 11 Nov 2023
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if the laptop cpu could draw as much power and be cooled as well as your desktop it wouldn't be so bad, but that's the compromise for portability
but also a problem due to intel stagnation until amd gave them a good kick in the pants with ryzen.
i'm looking at it and I'm pretty sure I could easily accept this thing being about twice as thick and 0.5kg heavier. If I ever retire this I'm finding one that has real cooling, if any still exist.
It's not just cooling but also battery draw.
You could buy a 2 kg laptop with a 45 W CPU, but then it'd barely be portable and after a few years the battery will last half an hour, what's the point.
What you want to know is called the thermal design power: TDP, and you can look up the data sheet for the CPU in the laptop to know what it is. 15-22 W is typical, 30-45 W what you find in "workstation" laptops and small desktops, 60-120 W in desktops.
I remember some of the T H I C C laptops of the early 00s, and I remember why people pushed for thinner and lighter - but I agree, I actually wouldn't mind them getting thicker again for better battery life or better cooling or whatever, the Air style of thin laptops are kind of a silly default marketing strategy in an era where everything's already pretty thin.