I heard that American mowers typically have no throttle control. Just low and high setting on the side of the engine itself. Australians are the ones that insist on setting the revs on their machines.
Sure it's nice to have that indulgence as the factory intended, but if it works fine otherwise...
It wasn't as much as the consumer choice here for the throttle-less control. It was force onto us by the manufactures as a cost saving method. And some the mowers here only have one governed speed and no high/low setting. Part of the blame also lays with the consumer too as they only want to buy the lowest priced mower.
It just like not having oil drains any more on some engines. Now we either need to turn the engine on its side or use a siphon to change the oil.
From my view as a tech and operator these versions are very inconvenient to me especially as you can't change the self propelled speeds without heavy drive belt wear.