Notwithstanding your comprehensive study that included a total of 2 other people, the reason it's a huge problem for Tesla is the broad number of lost sales from their botched headrest design. Those potential customers are going to Tesla competitors Toyota, Ford, and Nissan. Patrons of BMW and Porsche dismiss Tesla outright because of their well-publicized build quality, downscale interiors & drab exteriors.
What nonsense. I have no complaints with the headrests, build quality, "downscale" interiors, or anything else for that matter with my MYP. Tesla is selling everything they can produce as fast as they can.