Consumers seem to disagree with you on the first part. I personally think that current battery tech is fine for EVs (I have an EV with a 260 mile range, and only a 77kW max charge rate, and I think it's fine even for 10+ hour road trips), but a segment of the consumer space wants more than that.
I personally thought that the more interesting part of the article was where they claimed to be able to add 800 miles of range in 12 minutes. At those kinds of charge rates, my ideal EV would probably have a 300ish mile range that I could charge from 10-80 in <10 minutes (although I believe that part of the way they get those charge rates is with large battery packs, so a smaller pack would probably not charge as fast).
Additionally, while the specs for EV sedans are currently fine, batteries are only barely good enough for larger, less efficient vehicles. Maybe the killer app here isn't a sedan that goes 1000 miles, but a truck or SUV that can go 500.
The point is, whatever your and my opinions on the adequacy of current EV charging, the market seems to value improved battery specs more highly in the EV space than it does in the phone space (or maybe it doesn't and BYD is making a mistake by keeping their batteries for their cars instead of selling them to phone manufacturers).