Machine sewing isn't superior in all cases, for example hand sewn button holes can look a lot better. The hand sewn holes are cut first and then sewn which does

Machine sewing isn't superior in all cases, for example hand sewn button holes can look a lot better. The hand sewn holes are cut first and then sewn which doesn't leave frayed edges and has thread all around the hole. These button holes also lay flatter, which again looks nicer. Basically any fine detail work, or and stitching meant to create a 3 dimensional shape will be superior when done by a skilled tailor than by a machine. This of course costs more and doesn't matter for t-shirts or other informal garments.