If I press the close button I expect the window to close. But if I press an area near to the close button which looks like part of the application bar I don't expect the application to close, I expect it to do whatever clicking on the application bar elsewhere would do. Personally I think that is the reason behind the original bug, and why I think it is a valid bug that needed a fix.
For me the problem isn't "too easy to close".
If I press the close button I expect the window to close. But if I press an area near to the close button which looks like part of the application bar I don't expect the application to close, I expect it to do whatever clicking on the application bar elsewhere would do. Personally I think that is the reason behind the original bug, and why I think it is a valid bug that needed a fix.