Sometimes I think they have it right in Europe where you are limited to essentially starting with scooters and moving up in engine size over time. Too many newbs on sportbikes that don't know how to ride and get in over their heads. Sad story.
New inventions are fascinating. Here's an aircraft engine that is fuel and electric and is modular so more cylinder pairs can be added. Basic 2 cylinder is 170 hp and 4 cylinder is 350. The electric module is 80 hp. Optional turbo charged.