I am continually irritated by this behavior.
Yes, I do want to undo one operation. If I need to go fast and have little regard for correctness I can hold the button down.
Don't make me play the game where I hit undo, it undoes the whole sentence (or several), so I hit redo to bring it all back, and then I have to click backspace 5 times to get to where I wanted. Worse when I'm using multiple cursors and doing operations of different lengths to each line.