It's using less material and less landfill, but I wonder if it really is more sustainable in the grand scheme of things, at the scale of clothing and similarly sized items. The additional round trip shipping and workshop operations (HVAC, lighting, commuting, etc.) could potentially exceed the footprint of just sending you a replacement right off the production line. Obviously there's a crossover point above which this couldn't possibly be (cars, etc.) but it's probably a very blurry line, and I wouldn't be surprised if some companies knowingly take the worse but ostensibly sustainable option, i.e. greenwashing, for the resulting brand loyalty and word of mouth advertising.