VFR is the most dangerous situation to lose all systems in your aircraft. You're low to the ground, and relatively slow... and may or may-not have radar following or even be near a controlled airport. You'll have a pretty short maximum glide distance, and won't be able to communicate your emergency nor intentions.

Engine-out's happen in GA, sure, but a total loss is pretty rare. Bye and his company will have to prove beyond doubt his design is at least as good as existing decade's old, super-proven designs.