> ...because every car people are buying looks identical...
Why wouldn't you expect this sort of convergence? A bunch of companies trying to solve the same problems with the same constraints are likely to find very similar solutions. We saw it with aviation - over time, jet aircraft look more and more like each other, because certain solutions, once they become available (twinjets demonstrating enough reliability for extended overwater operations) are simply better in about every metric you'd possibly care about.
Why wouldn't you expect this sort of convergence? A bunch of companies trying to solve the same problems with the same constraints are likely to find very similar solutions. We saw it with aviation - over time, jet aircraft look more and more like each other, because certain solutions, once they become available (twinjets demonstrating enough reliability for extended overwater operations) are simply better in about every metric you'd possibly care about.