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  • James Martineau thinks this is interesting:

They are very intelligent. Their desire to be flawless makes them very anxious. Of all the procrastinator types, they usually have the most anxiety, and they are the most prone to depression.

From

Cover of The Procrastination Cure

Note

Why do they become depressed? Their pursuit for perfection leaves them paralyzed and whether they realize it consciously or not, they recognize this is not sustainable or practical.