I think there's more benefit than that. In my experience hand stitching has more "give," or stretch at the seams then machine stitching. Of course this might just be me trying to justify the premium I'm paying but hey, all reality is subjective, right?
@superfulous - I've got an 09 XK with 60,000 miles on it - have had a single problem with a window regulator. Nothing has fallen off yet. I'm not arguing jags are super reliable cars but not as bad as you suggest
Most interesting: guess which brands are made there, often the exact same shirts with different labels sewn in?
Brooks Brothers (of course)
Epaulet (odd because I thought they were made elsewhere)
A couple of other boutique brands