Because: 1. Removing weight. 2. Removing moving parts. 3. Removing cleaning cost Does not seem like a good idea? I have friends that are involved in aircraft

Because: 1. Removing weight. 2. Removing moving parts. 3. Removing cleaning cost Does not seem like a good idea? I have friends that are involved in aircraft design. They tell me they count every tie wrap for wiring vs. weight requirements. The remove as many moving parts as they can to cut mantaince cost. I worked at a company that made a complex piece of networking equipment. On the board they spent a ton of time engineering out caps. They only cost a few cents per board. The cost was not the issue. It turns out that removing as many as they could upped the MTBF by 40%. Everything is never that simple. Boeing did not just add this type of window because they thought it was cool.