Modern Amish buggy is more technologically complex than it looks.
What Changed
Headlights: kerosene → battery LED (brighter, safer). Brakes: wooden blocks → hydraulic disc (yes, hydraulics allowed). Springs: leaf → coil (more comfortable). Wheels: wooden → rubber tires (quieter, smoother — but debated: some communities ban rubber).
What Didn't Change
Horse. One horsepower. 8-12 km/h. Forever.