Sometimes we are not really avoiding the completion of a task, but we know that it’s too big to be accomplished by one’s single resources. In a case like this, for a person who doesn’t have additional resources, he/she will stay still in front of his/her unaccomplished task.
One more reason has to do with renewing old and obsolete things once again for the umpteenth time. In this case it’s boring and, also, tiresome.
Feeling bored and tired of doing something you have done for several times in the last ten years, just because it has to do with keeping it compliant is really boring.
Telling someone your deadlines is not that helpful as it might create further pressure and tension and someone’s solicits may cause real negative results.