How would it be hard to coordinate? You don't even really need a single thermal model, you just need a standard heatsink layout for parts to align with.
Which is complicated when you are trying to build hardware and realize "oh crap, the standard thermal layout leaves no room for us to actively cool <insert-x-part>, how are we gonna keep this thing from overheating?
The way we have our computers laid out today - vertical pcie cards, cpu sockets with either the amd snap-brace or intel screw in backplate heatsinks - is entirely arbitrary, but for posterity it persists as nobody wants to be the guy to throw out 10+ years of expansion card compatibility.
Which is complicated when you are trying to build hardware and realize "oh crap, the standard thermal layout leaves no room for us to actively cool <insert-x-part>, how are we gonna keep this thing from overheating?
The way we have our computers laid out today - vertical pcie cards, cpu sockets with either the amd snap-brace or intel screw in backplate heatsinks - is entirely arbitrary, but for posterity it persists as nobody wants to be the guy to throw out 10+ years of expansion card compatibility.