It tends mostly to be used for short runs, but last year I drove to Paris, to York and to Denmark. It is garaged, which may make all the difference. Garage is unheated but well built and only a few years old.
Previous Golf I had for six years, did slightly more miles 36,000, but again had no trouble with rust on the discs.
Can't believe they said it was lack of use.
Oh, I can believe they used lack of use as an excuse.
Sadly, garaging can make the matter worse!
When outside, the air circulating can dry anything wet - like brakes...whereas putting a car away wet, then leaving it for 2 weeks at a time, seemed to let the rust have free run of the discs.
I still garage mine...I just dry the brakes first and have had no issues since.
Maybe worth a try?