What is important is to have
What is important is to have just one standard in specific geographical markets, not necessarily globally. For example, BMW in Japan use CHAdeMO, but in Europe use Combo2. In Europe not having to have charging stations with Combo2 and CHAdeMO significantly reduces the cost of charging stations in addition to which Combo2 equipped cars are less expensive to produce because they use just one connector. Europe has avoided a standards war by the strong position taken by the European Commission requiring all CHAdeMO stations to be converted to Combo by end of 2018. If you could get your EV with whatever you want, that would be very bad because it would necessitate more expensive infrastructure against everyones interests.