You reduce the size of the tip well (not cut out the whole contact area) so that the well that is left is exactly the same length as the free edge yo are adhering it to. Thus when you adhere the tip, the edge of the tip well sits right on the natural smile line.
Then I Do buff the tip to make it thinner (as always) which means I can apply more product for strength. Takes 2 seconds to do.
Reducing the tip well does not change the shape of the tip. Velocity has tapered sides ( for oval or squoval shape) and Eclipse and Formation have parrallel sides (for perfectly square shape). All the tips have different C curve to match different nail shapes so all that still is relevant.
In my opinion, one doesn't save much time using this technique over blending, but it does save the natural nail from getting thinned by technicians who can't blend a tip without filing the nail at the same time!!
Another good thing about this technique, is that if a client breaks a nail, it snaps right off at the free edge which doesn't cause any harm or pain to the natural nail and makes a repair very easy as all you have to do is fit a form and sculpt on a new tip.