Form vs Function
Industrial design is the design of products to arrive at form, function and manufacturability. There was a time when cars looked different: Lincoln (expansive), Volvo (staid), Beemer (teutonic), Mercs (elegant), Citroën (élan). Nowadays they tend to look alike in part due to a dominance of function over form eg. streamlined and rounded to minimise drag. For bike designers, drag is less of a concern, and with no 'skin' and little form to work with, attention falls on the details as in the headlight and handlebar assembly of the Kona Splice-E electric bike above.