No it's in no way bad. I agree but, many stem plants if cut jagged will brown at cut. You can pretty much prune,cut,clip,trim, many diff. ways. By using a razor the cut is clean and it infact is less stress on the plant itself. As in many cases you can just use your finger nail and it's also fine. Most plants grow faster when cut back while others may take a bit longer to heal. (mangled cut plants) So not knowing what species yes I would suggest a clean cut.
Danny