Been said many times, this is for stationary batteries and it is a great idea. If it doesn't need to move, weight and energy density become practically irrelevant. Cost and charge cycles become much bigger issues and these alternative chemistries are doing brilliantly in this front.

I have been some folks try to say there is a limit of total Lithium availability and that issue seems to be wildy overstated. We are still a bit supply constrained but not because a lack of materials just a case of rolling out mines/processing facilities. So while production is coming up to speed, it is better to priorities its use for portable storage and use other types for grid storage.