I discovered that part 93589:
Was used in the Creator set Extreme Engines (31072):
This element strikes me as the sort of part-out-of-other-parts that was created to serve a single purpose: the front end on specific race cars. For most cases, it seems like the 4x1 slope curved can do the job quite well minus the slight curve at the front:
The element only gets used in the main model. What are some other uses for this part? Why was it created?