Actually, Ferrari and Maserati models are upgraded on a constant basis, but unlike German models, not from a MY to the next, but rather, through out the year because their production processes is not as rigorous.
I've been told by Ferrari France that on the 360, the software received mods every now and again but that's about it, so for Ferrari you are right, however, for Maserati, it's outrageous, they are the worsts by far!
They would change significant elements just like that, tough if you're a costumers who bought the car just before the changes, which by the way, were advertised on their website (New door panels, new cambiocorsa, etc.)
The Coupe and Spyder have had minor facelifts almost every year!

I guess it's good and bad, good bc they are striving for a better product on a constant basis, bad from a costumer management perspective.
Currently the F430 is so successful that nothing needs to be changed, minor additional options from time to time (carbon parts, etc.) but the quality of the product is so high that there's not much to be changed really.

Different story for the 612, after a first decent year, sales have literally stalled!

Mind you, not surprising for such an ugly car, especially when you have a DB9 for almost half price. 612 is far superior dynamically but that's not the priority #1 for thoses car's costumers.
Here's one example of form follows function that didn't work.