Yep, the 4-cycle dirt guys definitely get upset when they’re challenged on that one.
Rotating mass and friction in the driveline are the 2 things they seem to throw out a lot of the time. Hard to believe there’d be any measurable gains or losses from going bigger or smaller, but then again sometimes in life, there are things that you just can’t really explain.
Fortunately over in the sprint world, we seem to be at a consensus that a ratio is a ratio. We also normally go as big as we can reasonably get away with without risking chewing the teeth off the axle sprocket.