Normal map texture intensity filter

Why isn’t there a normal map intensity filter in Substance Painter?

The closest solution I found was this custom setup: https://www.artstation.com/marketplace/p/p39G/sp-filter-normal-intensity 

Most posts I’ve come across suggest duplicating the material and lowering its opacity, but when working with anchor points or needing to tweak scale/rotation, this becomes tedious. I’m wondering why this isn’t a built-in feature in Substance Painter by default.