I think the purpose of this ratio is that a predictable low is better than an unpredictable high. It's sort of the same idea as padding out an ECD. Better to sometimes impress than sometimes disappoint.
It is better. If you have a predictable low rate other people can still plan their schedules around you, while you figure out how to speed up / scale up. If you have an unpredictable rate, you block everyone else (and often yourself).