One big difference is that these EVTOL aircraft are small enough that they can use ballistic parachutes for an extra degree of safety. They usually also have more redundancy due to distributing thrust between many small electric motors. There has been a lot more research into autonomous drone flight than autonomous helicopter flight as well, which is crucial for safety and keeping costs low. I could be totally wrong, but I feel like battery, motor, flight control, and composite material technologies are finally good enough for EVTOLs to start making sense. Just like the tech boom of the late 90s there will be a lot of investment, most of which will be lost, but the survivors will have a big impact on society.