Are you implying there haven't been any battery breakthroughs? What do you think the average capacity, density and cycle time of a battery in 2003 vs 2023 is.
There has been a good gradual progress, and all the incremental improvements added up to much better batteries.
However, there regularly are press releases promising breakthroughs, but they either never reach production, or end up being one of the small incremental improvements, not a revolution.
https://electrek.co/2020/07/30/tesla-batteries-energy-densit...