What are the advantages of frameless windows?

We were also told that we had to have regular frames windows in our slide. Since we were ordering from the factory and knew we would never be opening the windows, we insisted on the frameless windows being installed. Those two windows do not open at all. We run one fan out and one fan in and it really cools down the inside and circulates the air. No need for us to open windows. And we eliminated those little windows beside the bed. The manufacturer thought we were crazy but we like it very much. Keeps the bedroom nice and dark which was a plus when we were in Alaska this summer.