well the flying cars is easy: there's two reasons. First, It's very energy inefficient. for transporting people, you'll never get the same effective range for the same energy capacity whether it's running off fuel or batteries- because ground vehicles have to push it along where aircraft have to both push it along and push it up.

Secondly, it's about size and form factor. what is a flying car? a hybrid vehicle designed to be able to switch between being a ground vehicle and an aircraft. Engineering is all about balance, and designing to fit a certain task. when you go with two tasks, suddenly you're making compromises to achieve both of them. And generally those compromises means it sucks at both of them.

Just one example of the compromises: do you want a comfortable on the ground ride? the unsprung mass of a typical 4 person sedan is around two to three hundred pounds, and that's basically just the wheels . a far 103 compliant ultralight is capped at 250 pounds.

You'd also have to pile on a motor (Or motors, or some sort of transmission system) just to drive it. You'd also have to have some sort of steering system. All of that is going to turn into dead weight when you start flying... which means you're going to need bigger motors, bigger and faster rotors (or bigger wings) which all equate to even more weight- and even more fuel- which makes the thing even bigger. and bigger. Until now you have to take off and land at an airport or something, and won't be allowed to fly into a city because.... well you're liable to fall out of the sky.

More annoyingly, you're now also maintaining basically to drive trains- and those drive trains are more complicated than they would have been on their own, which makes maintenance annoying, and expensive.

And that's just one compromise. It's a lot easier to just buy a car, and buy an aircraft. and you'll be more comfortable in both.

as for robot pets... speak for yourself. Sure, they're not sentient... but I got mine...