Back in the 2010s, EVs were primarily sold to customers that were more likely to be averse to SUVs for the perceived environmental impact and, frankly, snobbery (liberals of the time used to mock big SUVs like the Cadillac Escalade and the Hummer, particularly after they got associated with the timespan of the Bush administration before becoming uneconomical after the late 2000s oil price spike). Also the batteries just didn't have enough capacity at a reasonable price to build anything heavier than a sedan.

As soon as it was feasible, Tesla released a CUV (the Model Y) which now outsells the Model 3 almost 2-to-1. Arguably Tesla has fumbled by letting Elon pursue the Cybertruck rather than a full-sized SUV or normal pickup truck. You can observe that Rivian went after precisely those missing models.

They're mostly CUVs and above because fitting sedan seating into a CUV-shaped body frees up the height you need for a battery. Western OEM batteries were usually tall because they mostly used large-format pouch cells, because that promised the highest performance and lowest cost (spoiler: recalls are expensive).