It’s like anything else that’s multi-purpose; you buy a camera lens that could do 18mm to 300mm and it’ll never be as good as a two lenses that just do 18 and 300mm respectively. There’s all kinds of technologies that can help engines work above rev ranges for instance variable https://andyevjte.idblogmaker.com/31917609/little-known-facts-about-gearbox-cvt