This is great article:

Certainly VDF is an example of how serial tasks are still very important. Unfortunately there are a ton of uninteresting things that we need to do in VDF too: reports, SOAP calls, assisted validation, blocking processes that an idle event can't fix John (think uploads, downloads, etc.), external device integration (think GPS, monitoring equipment, etc.). Oh wait, not all of those were uninteresting.

If someone gives a rebuttal involving the sentinel, so help me God, I'll go after your children's children's children!