From what I've heard about other systems, if the system is given some wiggle room in when it runs tasks, then it can often run multiple tasks in a single wakeup, instead of waking up for one task, doing it, going to sleep for a very short time, waking up to do the second, etc. Wakeups, from what I've heard, carry overhead and increase power consumption, which may matter. (Also, if the CPUs are normally fully busy with user programs instead of fully asleep with zero tasks, replace "wakeup" with "context switch into the kernel".)

I don't know if this is what loeg had in mind, and I have not investigated the subject myself.