They did change the behavior on keyboard-driven accessibility, for the better. For example, the only way to navigate the finder menu in the past was with the arrow key. So say you wanted to do Finder->View->Clean Up. In the past that was Ctrl-F1 (or whatever you chose for 'open Menu' in the keyboard accessibility settings), then hit the right arrow key FOUR times to get to 'view', then hit the down arrow to get to 'Clean Up'. Now it actually responds to letter presses, so now it's just Ctrl-F1, 'V', one down-arrrow press, then 'C'. Sometimes when the down-arrow part involved going past lots of options that didn't have key combo equivalents, the old way could involve as many as thirteen or fourteen keystrokes. This new way really cuts down on that.