The ease of which you can take to the skies is getting absurdly simple. Flight controllers these days are doing everything for the pilot. Processors and sensors are creating their own environment around the aircraft much in the same way we do so ourselves.
The biggest upgrade? Obstacle Avoidance towards the front of the aircraft. While it isn’t a protective bubble around the drone, it represents a huge and important step forward.
I have the Phantom 3, and while I do not think it warrants upgrading to the Phantom 4, the future is bright.
Give me the protective bubble and 2+ hours of flight time and I will be one happy camper!