Because cleaning and organizing end your discomfort at once and leave a result you can see. The task you are avoiding offers neither. It sets off a feeling first: doubt, the risk of a no, a verdict on your work.
Take a quote for your largest client. It asks you to name a price that can be turned down. Your desk asks nothing. So you clear the desk, sort the folders and answer three messages, and each one pays you in relief.
An important result can judge you. I took that apart in Why Do I Put Off Everything That Actually Matters to Me?
Read the full article: https://impruvement.com/blog/productive-procrastination-why-do-i-get-everything-done