Flip flops are not shoes. They are devils work.  Cast them off.  They ruin feet in the name of ease. Can it be that much of a burden to wear a heel strap?
It is not a big leap to think that the feet are an important component of walking well. With each step the toes are meant to lengthen and spread— as well as contract— helping with the interplay of the foot’s spring arch.
There is no such interplay with flip flops. There is only gripping toes to keep the unsupported flip flop connected to the foot.
Flip flops are not shoes. Be done with them! Banish flip flops from your life.
There you have my annual flip flops rant. Have a good summer.