oh Agno,
and many one who missed point

The cause of the Limit temp, involved many reason material resist,

the most is not the Rotor, the rotor of Brushless is unlike the Brushed, Brushless Rotor Mag, are well enough in such hi temp's,

but the Most Problem is from Coil Coating's and stator coating/Plastics
which will melt in such temp's.