Should users use SuperUser for added security against threat models?

Avast Mobile Security Avast Mobile Security for Android
1

To deny applications access to personal information and internet on a selective basis ,
one can use Superuser for Android.
See: https://play.google.com/store/apps/details?id=com.koushikdutta.superuser
Is using this Android-App a good idea from a security point of view?

polonus

2

Well, sure, if you have rooted device, it’s a must. Doesn’t work on non-rooted ones (obviously).

Filip