Each time they've done one of these layered patchwork videos, they have talked about how the pre-cuts work with this technique. Pinked edges: curl when washed, with minimal if any fraying. Bias edges: Do not fray. Laser cuts: they are sealed and therefore do not fray, may produce a bit of a curled edge.
I may try it sometime on a table runner or something. I can see where the curled edges would lend a casual, rustic dimensional effect. My main concern is I feel it wastes background fabric, but that could always be cut away if it were that big a deal.