Originally Posted by boltjames
Putting it simply, BMW is building the car to always have DSC and DTC constantly in the 'on' position. It implies that they are taking shortcuts with the basic suspension because they know they have these two features as their security blanket, that they've designed the suspension system as a whole taking these two important systems into account.
So turning both of them off doesn't just change the driving dynamics, but theoretically is making the car deliberately more dangerous to drive.
I have a friend that works as a chassis engineer for another big German manufacturer and they use the car both with and without the nanny systems during the development. The nanny systems helps most drivers but the car is in no way dangerous to drive without them.
But a lot of people overestimate their skills and underestimate how hard it is to recover from an unexpected slide (wet patch, oil, ice etc) so of course they should be on during normal driving.