A) improving the eMPG (or is it MPGe?) of more cars on the road to reduce their fossil fuel consumption is better than giving a few cars zero-emission powertrains, courtesy of the 80-20 rule. (Hence the riddle about you having two cars you use equally and someone offering to magically take one from 40mpg to 1000mpg or the other from 10mpg to 40mpg - you are better off financially with taking the latter option.)
B) The infrastructure for fossil fuel mining is here but scaling up lithium mining is going to add new horrors to the environment and the developing world.
Toyota is just not delivering on the EV front at all. They could be cleaning up by stealing some of the Model Y customers back by selling a ton of RAV4s, especially the Prime versions.