As you fly now.I don't see why I would need collision avoidance. I can do that pretty well on my own, and who knows what kind of bugs you will run into with a system like that.
What about setting up a waypoint flight to fly around an unknown area? What about a flight path flying low and around trees? How about follow me as he walk around an area with buildings and trees? You don't do these things now because you can't do them safely. Also, you may have never hit anything but _plenty_ of people have. You may also fly to close to something one day.
Don't forget that it also adds weight, making the drone even more dangerous in case it goes crazy and crashes into someone, it will do a lot more damage than a 1.3kg P3...
Yes, that extra ounce could mean the difference between life and death. It's not going to be the existing 2lbs and spinning blades that will cause the harm, it's just that extra ounce. I can't take what you posted above seriously.
So a drone that packs down even smaller is a bad thing? Weight? Again, probably 1/2 ounce and the drone gets the same flight time as the Phantom.The folding arms are a great addition, but the p3 is not that big anyway, and now you are adding even more weight.
I have no doubt if your P4 had all of these abilities and I said my P3 was better that you'd count each and every thing you mentioned as a big improvement.
Collision avoidance and sensors will be standard on every drone in the very near future. It will also serve to open up a world of additional capabilities.