Why should you wash delicates in a mesh bag or pillow case?

I've been hearing you should wash your underwear and other delicates in a mesh bag or a pillow case, but I don't see the logic in that.





Can someone tell me why you should do that?Why should you wash delicates in a mesh bag or pillow case?
To protect delicate fabric %26amp; embellishments from snagging on buttons, zippers, etc. of other clothing.Why should you wash delicates in a mesh bag or pillow case?
It keeps the garments from getting snagged .