That is great when you can use bitcoin to buy luxury cars like in Japan. Because unlike using cash,when cars and motor companies are going to accept bitcoin as payment there is a big chance that more people specially who are holding and saving bitcoin can afford and buy a car even it is luxury or not. I think this will be the start of bitcoin's widen use when some big or even a small company and organization will see that even a luxury car company is already accepting bitcoin. This will be add more benefits to us because our transactions will become more smooth and convinient.
Yes it is very cool to see Japan lead in Bitcoin adoption in so many areas, it is these types of purchases where it makes sense for businesses to build in processes to accept bitcoin. It can be challenging at times due to the volatility, but I believe the benefits out way the challenges.