Originally Posted by
Akainakali
It requires time, effort and thought.
Plus, it isn't something that is intrinsically obvious to do.
Keybinding is a menu item and it's non-trivial figuring out what keybind maps to which tool bar item. Then you need to work out what you want bound where, everyone finds different keys easier or more difficult to hit/use and that's without even getting into using modifier keys, which can add another layer of complication.
Not to mention having to remember what everything is mapped to, which can be a major issue in and of it's self.
Where as an Icon on your toolbar that is flashing, is pretty obvious to click on.