I think you have a good point on external input noise. When you announce your plans to people close to you, such as family and friends and coworkers, you start

I think you have a good point on external input noise. When you announce your plans to people close to you, such as family and friends and coworkers, you start getting input which is not necessarily useful even if their intentions are good. Moreover, your announcement might make some people uncomfortable to the point where they try to sabotage you, either intentionally or subconsciously.