Why do many clipless pedals use bushings in addition to bearings?
Loose bearing-only systems have been used with hubs and bottom brackets, so why not clipless pedals?
Is it because clipless pedals are so small in size, so additional bearing contact surface area is desirable?
Are all pedals like this?
Relatedly, do any clipless pedals have especially simple internals (or access to internals)? I've heard that Time pedals are easy to service, but I haven't seen any official documentation on the subject.