Thought experiment: Would you rather work 4 days a week, so you have one to run errands; or work 5 days and have someone run errands for you. Let's assume the net income would stay the same.
Even if someone else runs the errands for me for free, i would rather have 4 day work week and run the errands myself. When i go to the shops by myself i might purchase something I wasn’t planning on purchasing or check out a new ramen shop that just opened up near the grocery store or make an impromptu stop at the movie theater.