Sometimes the patterns have a cost. The wrapper pattern added 8 kg to the weight of a WIKISPEED car, for example by adding an extra slab of aluminum between the chassis and the suspension.
Was the design pattern worth the extra weight? Yes, because that pattern allowed Team WIKISPEED to a) reduce several hundred pounds from the weight of the car by steady optimization, and b) react easily and cheaply to the changing suspension requirements. Had they not been able to do that, they would not have been able to participate in the final selection round.