For normal bikes I agree. Ebikes and especially cargo Ebikes suffer from lack of specialized parts. All the parts are the same as on a 10kg mountainbike. My bike with me and a load on it weighs 170kg. Make it 3kg heavier, triple the beefiness of all components.
And I don’t need 11 sprockets that are millimeter-thin when I only use 3 gears (for flat ground, uphill, and an emergency bailout for when the battery dies).