Exit from a building is usually not limited by access control. Either there's a button near the door on the inside which releases the door (cutting the current

Exit from a building is usually not limited by access control. Either there's a button near the door on the inside which releases the door (cutting the current to the maglock, or energizing the solenoid, or even mechanically releasing the latch), or there's an "emergency use only" fire exit nearby with a crash bar which opens only from the inside (and triggers an alarm when opened), or both. So no, slow badge readers are usually not going to be a safety hazard similar to blocking a fire door.