It’s like the rest that’s multi-reason; you purchase a digital camera lens which can do 18mm to 300mm and it’ll hardly ever be as good like a two lenses that just do eighteen and 300mm respectively. There’s a number of systems to aid engines operate above rev ranges for instance https://gearboxcvt08529.mybuzzblog.com/12349491/little-known-facts-about-gearbox-cvt