A framework 13" is 15.9mm thick and weighs 2.9 lbs. A macbook air M1 is 16.1mm thick and weights 2.8 lbs. So it's pretty darn close.
I'm sure that thinner and lighter laptops exist, but yeah, the framework is pretty thin. And at a certain point, it stops mattering. Being thinner wouldn't really provide much utility at this point.
The fact is that repairability is just not profitable for companies like Apple or Dell. They would rather you replace your entire computer when your screen cracks. But I very much hope that enough people do care about repairability to keep Framework afloat (and profitable). As an owner, I was astonished how easy it is to take this thing apart and replace things; I would guess that most of my non-technical friends can probably replace a monitor or a touchpad on one of these laptops with very little difficulty.