It's roof strength. You're lucky the windows are better than the side windows on passenger planes. For strength, picture a truss made of triangles. That is whe

It's roof strength. You're lucky the windows are better than the side windows on passenger planes. For strength, picture a truss made of triangles. That is where we are headed, with little "sideways pseudo teardrop shapes" between the triangles. People demanded rollover protection, not that rollovers happen much or couldn't be reduced with a lower center of gravity. We got rollover protection. Now we can't see out well enough to avoid crashing into things. Yea, progress!