does it hurt the audio to repeat a function

It was low roll-off specifically that I was using

Fair Warning the three tools in Audiobook Mastering 4 are designed to be used together. They are a suite, a “harmoneous grouping.” More crudely, they mop up after each other.

Low Rolloff is there so RMS Normalize and Limiter don’t get faked out by the rumble sounds in many home microphones. RMS Normalize naturally produces peak sound overload which Audacity can manage OK but can’t be exported. Limiter is designed to gently solve peak overloading.

Using them independently is dangerous.