Safety factor comes down to each individual person. If you can't control yourself, get a cage. If you have some self control, then you will be OK. It all comes down to common sense. You can get yourself in trouble with any setup, even stock suspension if you get stupid enough.
Personally, I will be running this setup WITHOUT a cage. (Maybe a cage will be waaay down the line....) as this is my DD for now. When I want to get super crazy I'll hop in the buggy, which has already been on its lid and have the roof sheet metal to prove it.
But it sure is tempting to go all out.....
Very good point. Probably some of the best days I've had in the dirt were at 70% pace even with my truck being caged. Sometimes it's nice to a have a good working suspension at that pace. It makes everything way more enjoyable.
Jarrett