I think the main reason for Cybertruck's shape is to reduce air resistance. The front is easy, the back is really difficult. They have to cover the back to reduce drag. That lead to the sloped shape.
All future electric trucks have to have this shape, or they have to use a much larger battery to achieve the same range.
Besides aerodynamics, there are two other primary reasons for the shape of the cyber truck:
1) There is zero reason for an electric pick up truck to have a fake boxy front engine compartment. This steals space from the passenger compartment, and compromises the view, in addition to the better aero you mentioned.
2) A triangle is the strongest shape. That triangular shape, gives the exoskeleton enough strength, that it obviates the need for a truck frame. Obviously, this greatly reduce cost, extra unnecessary weight, and it worsens the ride.
I really do not see any other choice for other manufacturers, other than to copy this design almost exactly. It has far too many benefits.
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