Hmmm, is it that clear tho? It took me quite a few looks at different seat/leather options before I noticed that the sports seats actually come in leather (you only see this when you click the info button and look at the pop up panel describing the sports seats, it says ‘seats in smooth finish leather right at the bottom!!)
It would be very easy for someone to choose sports seats, not realising they are leather, then go for the leather interior (including leather seats) option... and without realising it they’ve paid twice for the leather on their seats!!
But you’re right, the info IS there... you just have to be very careful when speccing your car not to get taken for a very expensive ride!!