We had the “slider” on our last cruise, in a PV. We spend a lot of time on the lanai. We couldn’t keep the slider closed as it just rolled back and forth. Obviously, from the outside, you can’t lock the door. The crew didn’t have a stick for us, so we had to move the outside table against the window, to block the sliding. BUT…..every time one of us went inside, hubby had to move the table and then move it back.
Our next four cruises we’ve booked the door. I understand both sides.