It’s like anything that’s multi-function; you buy a digital camera lens which can do 18mm to 300mm and it’ll hardly ever be as good being a two lenses that just do eighteen and 300mm respectively. There’s a variety of technologies that can help engines perform over rev ranges for instance https://gearboxcvt00852.full-design.com/a-simple-key-for-gearbox-cvt-unveiled-75151616