I think they are considered. There has always been the performance version of the Model S. It hasn't always been called "performance" but the version was always noted in one way or another.
For the death rattle, the suspension doesn't seem to be the factor that is causing the issue. Therefore there is no need to make a distinction between air and regular suspensions. I could be wrong on this point but most of the issues seem to be related to the half shafts and how the front motor is anchor to the frame.