Well framerate is defined by frametime. Though the average displayed framerate differs if the frametimes are not consistent.

What I am talking about with “smoothness” here is higher framerate, I am used to 120fps on most games, I normally lock my fps to that. You may not notice it going up, but you notice it a lot when going back down to 60.

Everyone has different standards and preferences, I’d rather not play any fast shooter at 60fps.