We're also still moving thousands of pounds of vehicle around a public highway to carry a 150lb human... so? I don't think it's a big deal. But yes drone delivery would be much nicer...for burritos.
You're correct, bikes are not practical. That's step one of analyis. Now we have to ask why bikes are not practical.
It's because everything is really far and we design our cities to burn as much land as humanly possible.
One side effect of that is that bikes are inconvenient. Another is that nobody can afford housing and starving homeless people are harassing you for money.
