/system/sbin in $PATH variable, but the folder doesn't exist?

I have a Chainfire-rooted Samsung Galaxy J5 with Android 7.1. The $PATH variable is /su/bin:/sbin:/vendor/bin:/system/sbin:/system/bin:/su/xbin:/system/xbin But /system/sbin appears not to exist at all. Why is this? Is it normal? Could the manual creation (and planned use) of this folder cause problems? (I run into huge ones, but not sure this was the cause.) --- *(I probably have made several mistakes, and I will post my questions one-by-one to avoid confusion. This is the first.)*