Many problems with shirts can be repaired easily. Like that fell stitching on the sleeve caps could be replaced with a machine stitch very easily, assuming the thing wasn't allowed to unravel completely. Even then it wouldn't be impossible; the most time consuming part would be refolding the seam. But such a repair would not replicate the original workmanship or functionality of the handstitching. Even Kabbaz has admitted that it is exceptionally difficult to get an armhole as soft or flexible using a machine (naturally, of course, he is one of the few able to).