Same point as having a dovetail drawer. they look cool. Back in the day, when glue was made from animal bone, the dovetail was used to add surface area for glue to adhere to. It also makes a mechanical joint, so if the glue did fail it would still hold together. Modern glues this really isn't a neccessary step, but people want dovetails because of the look. I'm the only person, (that I know of), that offers this inlay. Just something to set my products apart from the others.

This picture is of a friends house I did. Maple with cherry accents. Inlay in the center rail of the door, a small bead across the bottom of the upper cabinets, and a small piece under the crown. I need to get some different pictures the house looks much better inside with countertop, paint, and trim.