surely the idea of racing singlespeed is to race against other singlespeeders?
There are as many ideas of racing singlespeed as there are ideas of racing generally.
Logically, if there’s an SS category there should also be 3×10, 3×9, 2×9, 2×10, 1×10, 1×9, 7, 8 and 14 gear categories, plus extra ones for rigid, hardtail, FS at every 10mm increment, a semislick category and age categories in one-year bands. Might as well chuck in “people wearing red jackets”, “riders called Brian” and “riders born in a month with a R in it”.