Rotor Track
One of the often repeated premises of rotor tracking is that it's not necessary for the blades to fly perfectly in plane (let's discount those rotor systems constructed with stacked hubs). Rather, all that's important is that the vibration level be brought below the allowable threshold.
I've flown aircraft with the blades noticeably out of track (several inches), without an objectionable ride in cruise flight, but it always seemed that there was a vertical vibration in some other regime (on the ground at flat pitch, in a high power climb, low power descent, or steep turn).
Is it really possible to have a properly adjusted rotor system that gives a smooth ride in all regimes, but flies out of track, or is this merely a myth designed to placate us pilots and defer proper maintenance?
-Stan-