would you say flying airplanes faster or slower should also be responsibility of the pilots? what about speed boats within the city, should they be allowed? why on earth moving tonnes of metal at high speeds should not be regulated? considering 1,5 million people die per year from moving this metal boxes at hgh speed (comparable to the amount of people who died from pandemic that stopped the world for a year btw).
Commercial passenger plane speeds are not dictated by regulations. They fly in the most economical way for the company. Private planes fly as fast as they need to. Airplane speeds are only dictated by ATC when you're on approach or departure to maintain separation in a busy area or for noise abatement regulations.
Buses will not do 200kmh not because nobody can build a really fast bus, but because it will not be great for passengers to go from 200 to 50 really fast :) Basically same as with planes, passenger confort is the priority.
Anyway, if you would read up on Autobahn death statistics, very few deaths are related to over speeding.
If you mean vehicles transporting hundreds of people, regulations on speed are very similar to them on the road. You won't see a bus speeding at 150 Km/h.
If you mean private vehicles, you'd be surprised how even more lax are the regulations for private-owned airplanes. It all depends on the class of your airplane. Speed limits apply mostly on air traffic control direct indications and things like being on the vicinity of airports/corridors.
So yes, flying faster or slower is responsibility of pilots to a great extent of their own travels.
