Because the cost is probably closer to $10,000/kWh. Makes sense for a $1,000,000 supercar. Fundamentally all the new battery chemistries have serious underreported problems that make them dead-on-arrival. Either short cycle life (nanowire) or impractical manufacturing (solid state) or middling performance versus LiPo (sodium). Hopefully some of these may find niche applications where their advantages outweigh their problems but don’t expect more than a 50% improvement in density over the next 20 years.