we also want to make sure there is minimal tip bonding to the natural nail. Adhesive will always break down quicker than liquid and powder or hard gel, if you leave too much tip overlapping the natural nail this will lose adhesion a lot quicker, weakening the overall enhancement. Minimal tip overlap with a well less tip will help to prevent this.
Just as with using sculpting forms, you always have the option of trimming the smile line area of the tip to fit an uneven free edge shape, or even square off a smile line for a better fit.