because sometimes blender may be able to do a better job than maya or cinema, or because sometimes the maya and cinema people may need to hand down any kind of asset to the blender people due to workload and stuff like that :p

Besides, what good is having a program if you don't use it at its full potential, and I´ve seen some very impressive stuff done in blender.

nemirc
Renderosity Magazine Staff Writer
https://renderositymagazine.com/users/nemirc
https://about.me/aris3d/