The reality is the current designs (tear shaped, front engine, forward facing seats with belts) are result of slow incremental perfections. Safety, fuel efficiency being two biggest drivers (pun intended!). The biggest external factor being the infrastructure (you might have the greatest idea for next personal transportation vehicle) but if it doesnt use roads its pretty much dead .

So people complaining have no idea what they really want. Like Ford said “If I would have asked people what they wanted, they would have said faster horses”.