Quite possibly due to the position of it. Pretty sure the rear subframe has to be dropped to change it, so all in all, quite a big job for something relatively small.
I agree with Craig - ceramic coating is the way forward!
I'm now running my second XF, had both coated, current one is really dark blue metallic (Loire Blue?), always looks great!
J
If its a bit of added protection your looking for , take a look at ceramic coatings , I've used them for years and you only need to do it every 6-12 months , adds a beautiful shine that lasts ages and prevent dirt from sticking so you don't need to wash it as much 👍