There’s two big reasons.

No front grill

So much of a brand’s identity can be carried by the grill and headlights. And on an EV, there’s no need for a grill. But just a slab of flat metal looks weird, so they add stuff to break it up.

Drag

The range of an EV is a lot more sensitive to drag than an ICE car.

So in order to reduce the drag, shapes are smoothed out.

Aero efficiency becomes a much bigger priority than looks.