I got tired of bugs and spiders hanging out near those kind of windows, and the sun bleaching of things in the garage. One nice thing about a garage without them is that there is no sun bleaching on classic cars stored in the garage. Also there is a 10 second hack to break into a garage and it is easier to do when someone has those windows because you can see where and how to pull to open the door. Basically everyone has a safety pull on their garage door openers and that can be accessed from outside the door with a coat hanger or jimmy tool. I have mine wired so it can't be pulled but adding a window would let the thieves see how and also what is in the garage. With LED bulbs it costs nothing to turn on a light in the garage.