I think most people are unaware of how much the big ICE companies are using active noise cancellation and the piping in of engine sounds in newer model cars. Not even sure this is an advertised feature on many models. Most new cars make it very difficult to install third party head units without losing significant functionality due to integration of audio/hvac. The plus for consumers is integrated dash displays, steering wheel controls, better layouts, etc... The integration also allows the manufactures to do active noise cancellation as the audio components are much more integrated. I think it is a win for everyone...unless physical sound insulation is replaced with cheaper materials that weigh the same or more. For Tesla, the marginal cost of *additional* passive noise cancelling per unit of appreciable sound reduction is likely MUCH higher than for active given Teslas already have quite a bit of passive and the low hanging fruit is gone.