Yes, I see that it is a different function because one is called "Frame" and the other "Zoom", but it feels like the same: change the distance.
"With distance change, the video could look distorting and strange.So we didn't make the distance adjustment a default with the swiping. "
That is exactly the reason why I often miss a quick access to Zoom using the touch-pad that does not break the immersion . In some 180 videos the scaling is not perfect all the time and zoom is the only way to fight against distorting and strange look then.
However, maybe it is too difficult to implement.