The theory, that I heard at the start of the EV mess (UK), was to put the deadlines in place to motivate/tell manufacturers to research and develop the technology, otherwise nothing would happen. As progress is made, or lack of it, the deadline in the UK has moved back 5 years. And as progress continues, or lack of it again, it'll move another 5 years.The rollout should have begun with hybrid Electric vehicles to allow more time for the technology and the power grid to develop. The Democrats and their Green Globalist masters screwed the pooch by forcing EV ONLY waaaaaaaay before the grid or the technology was ready.
Car manufacturers have realised that affordable useful convenient EV's is only a dream. The CEO of Hertz has just had his marching orders, he believed buying in thousands of EV's was a great idea, and it flumped, BIG STYLE.
EV's are fly paper for the gullible.