and the aircraft exhibits no natural speed stability
Careful here with the vocabulary.
"high - or low - speed stability" refers to a somewhat degraded protection that uses pitch control to prevent an over -or under -speed situation : too fast and a gentle pitch-up is introduced, too slow and a nose-down pitch comes in.
Aerodynamically, the aircraft is just like any other "un-protected" product, and they generally don't fall from the air in droves !