Arguably having to use a mouse is too much action, because you have to move away from the keyboard, unless there are undocumented keyboard shortcuts.
I spend a lot of time on my computer not having at least one of my hands on the keyboard. Say I'm about done writing a commit message but I get a message on my phone I want to quickly check. It may be more convenient for me to use the mouse to hit commit later and then do some browsing tasks, or so. The other day I was doing some refactoring work while eating food in my other hand..
Nonetheless I believe having the option to use the mouse is better than not being able to.