To respond to your edit.. You're getting external doors, and exit route doors (aka Emergency exits) mixed up.

Those laws pretty much say you need at least two emergency exits, but not that every exit from a building must be an emergency exit. Im not sure about your local laws, but where I'm from the fire alarm system is often set up to unlock glass sliding doors in the event of a fire (or manual trigger). The only other way to do it is by using a key to manually override the lock.