I would presume because it turns out, in many cases, you have some tasks continuously running that don't require that much CPU, but a nonzero amount, and this w

I would presume because it turns out, in many cases, you have some tasks continuously running that don't require that much CPU, but a nonzero amount, and this way you can shove them on the LITTLE cores while the big core(s) go to town on single big tasks.