RAB your on the money.
I had a b series and now a fg both with leather and I must say the fg leather is thin but if you treat it weekly or monthly depending on the amount you drive.
My ba start to wear on the side and I never treated it 90000kms.
Fg a little bit of wear on the side. Second owner for 5000km 6 months and treat it every month. The only way you get wear like that is with jeans and other cloths with metal inserts. And lack of treatment.