[dognotdog]

As radiative cooling is a temperature to the 4th power (T^4) process, vs. linear (T^1) for conductive and convective cooling, one could certainly increase power density for general electronics, though the danger of setting something on fire, and actually needing higher temperature packaging / soldering / bonding processes might put a crimp on that.

However, space craft would be where being able to run hotter would significantly reduce the size and complexity of cooling systems, as they can only use radiative cooling bleed off the heat they generate into space.