That's why I never connect a mouse on my laptops. I've got a touchpad that's part of the keyboard. I select text with it and paste with its middle button. I only buy laptops with three physical buttons precisely because of this user case. A mouse would slow me down.
Where a mouse is really needed is in action games. A touchpad is too slow there.
Maybe, but I'm not sure about it. They are very different in location and interaction patterns.
In this context there is a lot of difference between a mouse and a touchpad. For example, I select text with the keyboard most of the times in emacs and in any other input box (not in vim, is it even possible?). So I'd lose time by reaching to a mouse. I hardly have to move my hands to use my touchpad.
Where a mouse is really needed is in action games. A touchpad is too slow there.