Even with a rocket deployed parachute you need to be at least about 200ft above the ground for it to work. So there's a dead zone during takeoff and landing where you're too high to survive a crash but too low to parachute down. Military VTOL jets like the Harrier and F-35B address that risk using zero/zero ejection seats which can launch the pilot straight up high enough for a parachute to work but that's obviously not feasible for general aviation.