It seems to be a bit of a lottery. My 2017 GS Rally is perfect after 17,500 miles. Not a hint of corrosion anywhere.
I have just ordered a new GSA so I hope I will win the lottery twice.
It is, sold my 2014 RT in 2019 to buy my 1250RT. Put nearly 25k on the RT in all weathers, not a mark on it. Only got 6k on the 1250 but looks good at the moment.