The Jetson One video seemed to show them flying pretty close to the ground - I was wondering if that was to reduce fall height in the event of loss of power.

Your comment seems to indicate that one is sort of trading problems, not really significantly reducing risk (at least at the speeds one would want to go) - do I understand that correctly? Mind slightly expanding? Is the problem that you basically hit the ground with your full speed rather than having some wind resistance reduce your speed before impact?

That's called an ejection seat, right? As in a rocket-propelled vehicle to launch you sufficiently high out of your aircraft to allow your parachute safely to deploy (i.e. about a hundred meters, as described in the prior post)