This gets into the subjects of capital budgeting and product planning.  The majors invests heavily in product planning with carefully choreographed market studies to develop product to meet perceived customer demand.  Even then there are times when the product doesn't have any viable markets.  This is, in part, why the majors are reticent to enter the EV field.  Musk, on the other hand, shoots from the hip and believes that he is of superior intellect to determine what will meet market demand.  Concentrating on crossovers not only meets current market demand, it also benefits from the current state of technology of EVs with higher ground clearances for large battery packs.