Not necessarily true -- failure modes aren't great tho. You can run off and also can do a controlled fall. If you go over your handlebars on a bike you are probably in worse shape (but going over handlebars seems less likely than having to run off the wheel.)
I am looking forward to next gen wheels which will offer more redundant components. I've been lucky to only have had a few falls during learning phase where I was padded up. Once your muscle memory is set basically hardware failure seems the only way I could imagine taking a huge spill. Generally speaking obstacle avoidance and so on is subconscious, you can get yourself out of a lot of bad situations due to tight turning radius, responsive speed control, offroadability, etc. For example going off a curb or onto grass or up a hill is no problem vs a boosted board.
