But hopefully, they do get around to it. I can't wait to get rid of the power bricks.
You are getting it better than the rest of the world. Power electronics is once of the last semiconductor niche where US has both the edge in already, and a prospect for future growth.
You have to thank your military for that. Military use power electronics is a giant market in USA, but it's also a very pathological one. US military buys simplest bucks and boost circuits (for non-engineers, those things amount to "power electronics 101") for few thousand dollars a pop.
Few months ago, I had a chat with BYD engineers about their own power electronics problem. The best China got domestically are few generations old IGBTs. E6 for example has a 89% efficient powertrain, as I was told. The only Chinese power electronics company on the road to SiC I know is IVCT, and I haven't seen them showing any life signs for quite some time.
They want to eventually do their own power electronics, or at least fully own it from the packaging/integration stage.
You can see how far Tesla went in Model S to Model 3 inverter design when they switched to SiC switches. Model 3's inverter is microscopic in comparison to Model S ones. And apparently, it's also more efficient at the same time, without any extra tricks used.