As groundcrew at CFS, '81- '93 all parachutes were left in seats and it did worry me about muscle memory & unlocking seat harness & parachute QRF together every time you exit the aircraft normally. I did on occassion have to do countless canopy jettison resets in the hangar so all pilots could actually experience canopy emergency opening. As an occasional passenger I also had to practice emergency abandonment. It wasn't an issue not unlocking the parachute - it was too novel an action in the first place. When I was in the cockpit ground running there was no need to be strapped at all.