Actually you will feel more "barefoot" running or hiking with the 5 fingers. You can really feel the peebles and small rocks, although there is enough protection on the soles, so you shouldn't get bruises. I think it is because there is no side support at all, and your feet can "expand" sideways. I don't know if I am communicating the expanding properly.
Your comments of getting one's toes broken, is why I rarely hike in them. Especially the little toe that is exposed. It is the smallest toe, just waiting to be injured.
They are a viable solutions for some situations, you will get more of a barefoot experience, and it will change how you footstrike. I would venture that if you did a normal long run in these, you will have some sore muscles, as you will be using them differently... that is unless you have been doing a lot of barefoot running.
Bottom line, I am hiking and running most of time in trail runners or racing flats now.
They are heavier than racing flats and your feet will STINK!! However they will last much longer than racing flats. Pretty impressed with the sole material. I wore out a couple pairs of racing flats last year.