That little sliver of a ferrule will not increase deflection that you will be able see. Any "perceived" defl. increase is, imo, outweighed by the visual aid of having it there. Also makes it far easier to replace tips, something that on a Revo is kind of a pita.
As for the ferrule increasing deflection to a noticeable difference, well,... that would probably depend on the "individual".
As for easier maintenance, yep...for sure.