I have a work laptop with a 12850HX + 3080Ti and 128GB of ram for work - even if you remove all the cooling from it, all the components still take a huge amount of space inside. The 128GB CAMM module for ram alone is larger than the entire motherboard in macbooks. Also the cooling would need to be able to deal with ~200W of heat, even solid state cooling would be quite large for such an amount of heat.
that green module on the right is just ram. And Dell is trying to make this the future standard for ram modules in laptops. (ignore the dust on fans, I was in the middle of cleaning it).