Warning, the following is personal opinion and not everyone will share this view.
The theory of being inline with the drilling axis works well when you can get you body inline with the drill. This works very well on the small size of the CXS but.....on the larger C drills I find it to be more of a liability than asset in some situations. When reaching up, down or sideways, I find the C drills are harder to apply force than the T drills. This is mainly because of the elongated trigger on the C drills. The long trigger doesn't allow you to get more than your pinky on the main grip. The index finger and thumb are on the upper body of the drill and don't add much in the way of grip. The middle and ring fingers are on the trigger and don't provide any grip on the drill to apply force. This means a much weaker grip on the drill and subsequently less force can be applied to the drill when reaching. For this reason I find the T drills to be better suited for the general construction type work I do.