Writing things down, making a public commitment, pinning an item on the calendar.
To some these actions mean being one step farther to actually doing.
It is a form of resistance. It does not matter if we are in charge or if someone else is in charge. The very same moment we are saying “I am going to do it”, an almost unconscious reaction is triggered that goes the opposite way: “I am not going to do it”.
The only cure is to deeply understand that no one cares.
Your boss might be disappointed, they will still be your boss. Your company might lose some money, they will most likely survive. Your friends are going to stop relying on you, and go find other friends. Your project will probably be delayed, and your audience is going to seek something else to give attention to.
The only one person who has deeply to lose from this behavior is you.