My thought, too. Not to mention this is a missed flight waiting to happen, IMO. All it takes is one of a single accident on the way, unusually busy parking lot, a Nexus/GE random referral or machines down, or a security backup, etc.

I never assume everything will go smoothly every time. I normally arrive at YYZ 60 - 90 minutes prior to a transborder flight, even though on most occasions I've cleared security in ~10-15 minutes. Makes sure there's some time to relax in the lounge before the flight, too.