The fact that they’re still vastly less efficient than mass public transport, bikes or just walking.

It's not just energy and CO2. Roads and spread out human development disrupts ecosystems and natural water flows. They result in the death of species, plants, animals, insects. Mining the material required to build cars and infrastructure also has significant ecological impact.

Please note that less than 18% (likely around 10%) of the world's population own cars [1]. 5-10x the number of the current cars in the world, even if they are EVs, will have more than a 5-10x impact on the environment since ecological systems are non-linear in nature.

[1] https://www.motorbiscuit.com/number-car-owners-world-less-th...

We have mostly EVs sold in Norway the last few years. It's not been so great: https://www.vox.com/future-perfect/23939076/norway-electric-...

The tires, rubber emissions account for a decent chunk of ocean pollution. https://www.thedrive.com/news/tire-dust-makes-up-the-majorit...

Still, if you solved those issues as well (and there is progress afaik?) it'd be fine. Cars are handy, and a necessity if you live somewhere rural. just keep them out of cities as much as possible, except for larger transports and emergency vehicles.