Comment 185 for bug 532633

Yes, Mark: flamewars aside, please ensure buttons on the left are not turning into a nightmare when GNOME Shell is used. I can confirm that reaching e.g. the icon button in the left corner of a maximized window is very likely to lead you to hit the hot corner, especially on touchpads - and even for experienced people.

It's a common practice to move the cursor to the top right corner of the screen, and then move it down to the close button of a window, instead of fighting to reach it directly. This won't work when Ubuntu switches to GNOME Shell, and reverting this after Lucid would be too bad.