There is, but weight, cost, etc.

BLDC motor design also has a conundrum - most of the heat is made in the motor coils, and they can be designed to get up to about 250C, which makes them easy to cool.

However, they are wrapped round thermally conductive steel touching thermally sensitive neodymium magnets which have to stay below ~60C for full performance.

So it isn't simply a matter of getting rid of heat - it's a game of preventing heat transfer.