He was talking about the hijacker entering your car *before* you start your engine. If you rely on the brake lock to lock your doors, don't you have to start your engine first...

Rely on brake lock, die (but it helps forgetful people).
Rely on speed lock, die (but it helps forgetful people).

Just press the lock button after you close your door. End of story.

Now, flaws. Not really flaws, just things I don't like.
Latio. The name. Always reminds me of FELLATIO. Sedan is ugly. Non-sporty wheels, tyres and brakes for the Sports version.
Swift. No boot space. Looks too similar to Myvi.
Vios. Center meter panel. Uses old engine. E spec. Just give ABS and twin airbags as standard, dammit.
City. 185/55/15 range means true comfort tyres like Bridgestone Turanza GR80 and Michelin MX V8 won't be available. Bumpy. Even with 4 extra spark plugs, IDSI FC not so significant from VTEC's.

These are opinions, no need to argue, there's no right or wrong.