No other reason, other than I've not had the car that long.
Will probably switch it back on when the weather improves next spring, about the same time I plan to upgrade my wheels & tyres - hopefully Michelin will have the pilot sport 4s tyres in 18" by then.
I get the new car worry, I also wondered whether I was doing the right thing messing with settings withing the first month, but not any more
I can only imagine having the diff on its increased traction setting would be a benefit. How often do we corner that hard in daily basis anyway? I changed coupled of other stuff that I need to try: XDS set to weak, and couple of brake mods and all together they should make for a much more natural behavior.
Another one that hopes PS4S will come out in 18" eh? I'm on the same boat but if nothing is out till next April it will be the perfect excuse for 19" aftermarket summer alloys...
In fact there is one 18" size already out (at least in US) but it's a stupid high 245/40/18 it looks almost like a 4x4 tyre.