I've honestly never quite realized up until now how utterly ridiculous it is that people (especially in the US) regularly demand that their food be chauffeured to them.
I'm in a small city, with a lot of rural / suburban areas. I'm often delivering 15+ minutes away from the city center by car. A bicycle wouldn't be able to get to any of these places in any reasonable amount of time, and there's also no shoulders or bike lanes on most of these roads so it would be seriously dangerous.
We also do a lot of large grocery delivery orders (50 - 100+ items) so there's no way those can be done via bike or motorcycle.
Am in Europe and we have a delivery service which provides everything by bike. And we make sure we don't order when it's raining even though the bikers don't seem to care.
Yeah, I don't think I've ever had anything delivered by motorcycle. Wouldn't be much less sluggish though, except in very dense cities with grid-locked traffic. I've heard motorcycle costs are about the same as a car, due to more maintenance being needed (frequent tire replacement, gear replacement, etc). Some cars approach about the same MPG as motorcycles too (and EVs surpass motorcycles with MPGe). Many US cities are very spread out and a lot of travel is done on highways, requiring 700cc+ motorcycles, and stuff like lane-splitting is illegal in a lot of places.