Actually, several of those editors were explorations of what programming would look like using just the mouse. The mouse isn't really the issue with programming

Actually, several of those editors were explorations of what programming would look like using just the mouse. The mouse isn't really the issue with programming performance, per se -- instead the problem is the constant context switching back and forth. Several version focused on just the keyboard, but we found that most of the things we built using Eve were inherently visual, and as such needed to be tested and interacted with using the mouse. Since we can't eliminate that context shift, we tried doubling down on it. As a die hard Emacs user, I was shocked by just how competitive the mouse could be in the smalltalk-esque environment we built.