Was born with super small feet in the 1st percentile as well as hands due to a benign genetic issue. Totally healthy but shoe shopping is always awkward. Have decent balance and can walk and run fine as my calf muscles are quite developed to compensate. No, the myth isn’t true.
I dated a girl in middle school who had this issue. You used a wheelchair, not because he legs didn’t work, but her feet were to small to support her body.