IMHO, if someone NEEDS 100 hours of multi time, his total time shouldn't be that high, therefore, a bit of hand flying is not optionnal, since if he/she looks for an airline carreer, hand flying time is not the highest of all.
The purpose of "building" hours is to enhance the basic skills that will last for a long period of time.... Otherwise he/she might as well, start the engine or run the hobbs without flying..(ie on the ground). Safer, Easier, cheaper and no autopilot needed !!