We know that belt drives are limited in their max possible power rating and most high power/torque applications(trucks) use gear drives.
I wanted to know the main factor that limits the power/torque rating of belts.
Is it Frictional slip or Belt material?
If the frictional slip could be eliminated somehow(assume), are the materials used for belts currently, capable of handling high torques and power applications?
Is the material limitation the reason for the introduction of steel belts(where friction is still present)?