I can certainly see situations to face the other way, and wouldn’t think twice if I got in an elevator and someone was facing away from the door. It just seems less of a social construct and more of just practicality.

Now, who gets to press the buttons in the elevator, and whether you should ask for someone to press it for you or ask them to move aside so you can press it, are definitely things I struggle with if there is a group of people getting on an elevator at the same time. (I usually just let that one go without me and wait for another one)