Funny, the three main benefits from solid state batteries that I'd be interested in (faster charging rates, better handling of extreme temperatures, and increased longevity/lifespan), you never even mentioned.
They may be better but empirically the current tech is already plenty good enough on those fronts for cars (for fast charging the limit is already most often the charger if you are trying to prioritise that), so unless the cost difference is small it's gonna be a tough sell.
