The DCL isn't mandatory though. Home Assistant only needs it for device firmware updates, but it's always going to be the case that those come from the internet.
Their battery tech is a years ahead of everyone else, from the basic chemistry to the manufacturing process.
Some are, others are adopting Matter which is local only and an open protocol. Vote with your wallet.
Some car manufacturers want to wring more out of their investments in hybrid drivetrains. They are also hoping to delay long enough to catch up to the Chinese on battery tech.
Toyota is a great example. Their solid state battery tech is always a few years away from revolutionising the industry. They tried and abandoned hydrogen.
We have a similar problem in the UK. Courts and juries tend to believe the police, even though they have a reputation for lying.
Weekends were made for programming. - Karl Lehenbauer