If you can remove the key of an A/T equipped vehicle it simply means the car lost this safety feature. Some cars won't allow you to lock your doors with the key in the ignition if there was an input from the driver door courtesy switch. Most Hondas you can't lock the door without using the key or RKE transmitter. All military tactical vehicles now are A/T equipped and don't need a key( imagine being under attack by the enemy and you can't find the key) just like aircraft and ships.