>Which implies it is better to delay switching until we have better batteries

Let's discard everything but road maintenance?

No thanks. https://ourworldindata.org/grapher/co2-mitigation-15c

> Let's discard everything but road maintenance?

not what I said. The points were:

1. its not all good.

2. if we buy cars with battery chemistries that will soon be replaced with better ones there is a good argument for delaying purchases. Not having to replace the cars again, for example.