> How is a mouse more efficient than an ability to move to a phrase with a bit of typing, skip words ahead with a single letter instead of ctrl + shift, move to a new line and a specific place on that line with a couple of button presses, etc?
I can't improve on your explanation as the answer to your own question. Obviously using a mouse to cut/copy and paste, within the same document or between independent documents, is more efficient than what you just described.
