I'm not sure about the "never to wear the same pair two days in a row" part, though I usually do alternate shoes in some fashion.
My mother was a physical therapist, so we always wore shoes that were properly fitted and were good to our feet. (I wore arch implants made by an orthopedic surgeon when very little, and wore "corrected" shoes for some time after that.)
Interestingly enough, a lot of people wear shoes that don't fit them properly because they can't feel the difference and/or they can't find shoes that fit. A lot of shoes come in a limited number of widths, so people who need narrower widths end up with shoes that are too short and people who need wider widths end up with shoes that are too long. I am a man with narrow feet, and it can be a challenge to find shoes that fit my feet.
- Murray