Not saying it’s a good idea, but a lot of the complexity surrounding automated driving is actually because you are confined to a 2D space and have to follow roads/road signs. When you can just lift off and adjust verticality to avoid objects all you really need is a way to detect and avoid obstacles and some navigation logic. Landing is probably the most difficult part to automate.

Not super easy but it is actually easier than self-driving cars (which is why almost all of a commercial flight is running on autopilot)