Why input actions are available in Actor but not in Actor Component?

When I configure an Action Mapping like this:

136911-screen+shot+2017-05-05+at+5.22.36+pm.png

I can use it as an action mapping in a Blueprint Actor class like this:

136912-screen+shot+2017-05-05+at+5.22.59+pm.png

But, on the other hand, this is not available in a Blueprint Actor Component. It is clear that lots of Actor Components could be created to do something based on input devices. Why this Action Mappings are not available in Actor Components? What is the logic behind that decision?

Thanks!