Insulation is one of the big three. It costs to reduce large amounts (pounds)weight and volume at the same time.
The military modular system is warm and probably put together like a tank.
You certainly can't get an OQ/UQ or pod system for 150 bucks, but if you take that 150 and subtract it from the price of the lighter gear, I think you can see where this discussion has been going.
Pounds have price
Don't waste your breath
Don't waste your heart
Don't blister your heels
Running in the dark