One thing that Musk has and BYD doesn't is the eager attention of the world's best engineers. Musk has an interview where he described SpaceX having designed things in house instead of buying them, and coming up with much better solutions. I imagine that battery and rockets are similar to software in that regard - a top engineer is 10x more productive than an average engineer. Combination of scale and engineering talent might be Tesla's bet to stay ahead.
Musk is a great marketer. I would be reluctant to conclude BYD doesn't have the attention of great engineers though. There's a very large talent pool to pull from in China.
All told, more energy storage production is a good thing, regardless of the producer. There is a massive technological shift underfoot, the next 5 years are going to be fun to watch.
One thing that Musk has and BYD doesn't is the eager attention of the world's best engineers. Musk has an interview where he described SpaceX having designed things in house instead of buying them, and coming up with much better solutions. I imagine that battery and rockets are similar to software in that regard - a top engineer is 10x more productive than an average engineer. Combination of scale and engineering talent might be Tesla's bet to stay ahead.