The mile-high toolbar thing is right - a target at the side/corner of the mouse catchment area is easier to hit than a target you have to navigate to stop insid

The mile-high toolbar thing is right - a target at the side/corner of the mouse catchment area is easier to hit than a target you have to navigate to stop inside. But this is only right because no usability metric is attached at this point. If the mouse-button story were just that it takes some milliseconds longer to click a control when there are two, then yes. Likely it does. But you go farther to attach usability claims to it and that's where you become wrong. For one, the one-button mouse thing was tested on people who aren't used to it. Maybe it takes a few days to get the hang of but it's not the kind of thing where someone who knows what they're doing hits the wrong button. And even if it were more than microseconds slower for the base physical action, it gets more done in that time. You have to set down your drink and reach for the keyboard with your other hand and I've already right-clicked and am done. Without knowing out workloads you can't make blanket statements like that, and I think that almost anyone could benefit from using more complex control, and macroing, etc, but only once they have a solid understanding of the thing they're trying to do. "Had to suffer with 2-button mice." Hilarious. Stockholm syndrome.