Are Apple Eurocentrists or racists? What about Toyota, Honda, Nissan, Hundei, Deawoo? Tata? Lots of people make cars, even high end cars. Lots of people have battery experience.
With the exception of Toyota, none of the manufacturers you mentioned manufacture luxury cars. BMW or GM have superior battery tech. BMW has superior ancillary automotive systems, as well as longer experience making tech-laden cars (see E32, E31 et al.)
They simply want the best, highest quality partner.
Edit: Acura is not a luxury manufacturer. Their best selling car is a better-looking Pilot.