Ha, after some research turns that there is a method to this madness. After all the walking and running shoes are not created equal and if you use one for both purposes .. :
When you walk, you impact the ground with 1.5 times your body weight; however, when you run, you impact the ground with 3 times your body weight. Most runners land on their heel, midfoot, or ball of the foot. ... Walking shoes should not have a big difference in height between the heel and toes.
https://www.holabirdsports.com/blogs/news/can-i-wear-a-running-shoe-for-walking