Most lifts have the buttons inside, the ones that tell the lift which floor you want to go to.
Yesterday I used a bank of lifts that had the buttons on the outside. You choose your floor before the lift arrives, this gives the computer extra time to figure out the most efficient way to use the lifts and send you one that will go straight to your floor.
All very clever, except nobody told me. I spent about 20 minutes getting in and out of the first lift to arrive and ending up on the wrong floor. It was like a French farce.
Somethings, like the QWERTY key board are easy to improve, but because everybody uses them and they work well enough the inertia is too much to overcome.
Sometimes “good enough” is… well… good enough.