I'm sorry, but this is WRONG and I need to correct the misinformation, because people will read and believe.
At sound check when setting up, to be sure, set your fader at unity then adjust the input gain level to appropriate level ("tickle the orange".??). but that's it's.
Faders are used to set the amount of properly gained channel in the overall mix.
They do NOT NEED stay at unity during the show, nor should they be unless a specific channels gain structure warrants.
Yes, it CAN be done in the manner described in the quote if FOH and monitor mixes are on separate consoles, but shouldn't be.
My bands all have IEM rigs, but we still gain stage the inputs. Very few (if any) of the faders on anyone's mix are at unity during the show.
I'm not sure what "smoothest place of travel" means as many vendors consoles have fader "sweet spots" in places other than unity.
Experience on each will indicate where those are.
There shouldn't be any downstream clipping if gain levels for each channel are set correctly. caveat: I'm ignoring effects and output buss levels.