What sodium ion lacks in energy density, it actually partially gains back in the reduced need for cooling. The same properties that make it work across a larger temperature range also mean that you don't need a lot of (or any) cooling/heating to condition the battery. That means less weight is used for that and less energy is needed for running a heat pump.

Another thing here is that volumetric density matters more than weight density in cars. Space comes at a premium and while weight affects efficiency somewhat, it pales in comparison to aerodynamics and rolling resistance. The difference between the best and the worst cars on the road is at least 3x. You have some heavy, brick shaped, monstrosities that barely do 1.5 miles per kwh and then you have some cars with low drag coefficient that easily do 5-6 miles per kwh. Even swapping tires can add meaningful range. Weight reductions help a bit but the difference between the best and worst energy densities on a 60kwh battery is probably 1-2 big passengers in terms of weight.

Peak energy makes sodium ion batteries for energy storage. Their pilot batteries are deployed in a desert. High temperatures during the day, freezing temperatures at night. They use only passive cooling without any moving parts (fans, pumps, etc.). Aside from that being impressive, that also lowers maintenance cost because it reduces the amount of stuff that actually needs servicing.

Sodium ion gains back volume because it doesn't need cooling. At the cell level, they are worse but at the pack level, it starts looking pretty decent. Anyway, there are multiple sodium ion batteries on the road now in China. It's practical right now. The rest is just the widening technology gap the US and EU have with China. We'll just have to wait a few years for local manufacturers to catch up. Some models with these batteries will probably start making it to the EU in the next two years or so.