Door close buttons do close the door, but any time a normal person is using it, the door is already about to close as fast as it is allowed to when you press it

Door close buttons do close the door, but any time a normal person is using it, the door is already about to close as fast as it is allowed to when you press it, so it's not going to close any faster. If you're a maintenance worker however, who uses it outside of normal operation the door close button has to shut the door or it won't shut until you put it back into it's normal operation loop, and also because if it doesn't shut the door it will fail a fire test.