I remember the leather interior in both of my 350z's was terrible. I had the orange in both of them though, so it showed everything. Similar wear and tear to the picture you have attached.
The fix some how reminds me of the roof in the 350z convertible - tears around the wear window due to the electrical cables around it - obvious DESIGN FLAW. Instead of fixing the root cause of the problem (either wrapping or moving the cable so it didnt rub against the roof), Nissan just put a brand new replacement roof on it under warranty but shortly after - the roof just rips again because the cause is not fixed.
Im under the impression the seat issue is either poor quality leather, or poor stitching (if it starts to tear). Unfortunately im assuming the replacement will be exactly the same quality as the first one. So how do we prevent the wear and tear from happening again? Seat covers? Getting in and out of the seat differently (not putting any weight in that area (inconvenience..)