Setting a new PB or top 3 is a really exciting thing, but why are there so few categories?

Something below .25 Mile would be useful for sprint sessions. Also having nothing between a 5k and a 10k run (could be 4 or 5 mile Best Effort) is kind of wild. Additionally more categories in the higher mileage range would be quite helpful as well like 7 mile, 8 mile, 15 mile etc. The more the merrier after all.