Different sects have different rules. Some have no rubber tires, so steel wheels is ok and tractors are used; some have no self-propelled or powered machinery and so they have a forwarding cart pulled by horses that is ground driven to a PTO to run pull behind equipment; some have a powered forwarding cart with engine driven PTO all pulled by horses.
Some are allowed electricity for motors only (barn fans, hay elevators, feed grinders, etc. but none in the house.
Different strokes for different folks and I don't know why it's that way. Probably same reason there's a bunch of different Christian based religions all saying they are the only proper one.