Mast bending? Possibly - there is a couple between the rotor hub and the ship C of G.
The Bell 206 limit is thou shalt not pull more than 85% torque at speeds over 80 kts - one reason is because the mast is quite long, so there is a powerful moment arm which will increase upper mast bearing wear, and to prevent mast bending stresses.
Dunno why the AS 350 has it - I doubt whether a load would fly at more than about 60 kts anyway
phil