Yeah, but just setting a goal and completing it is something a lot of people just don't do anymore - not when you let yourself get distracted by things like emails, messages, or people appearing at your desk. Focusing on getting a task done (and not tolerating any distractions from that) is the main point of the "technique", I'd say.

As with goals, this will just push you in a direction. You don't have to be absolutely rigid, but at least you'll start to feel when you are straying from your real goals.