Ian. You seem to have missed my point entirely.
Dynamic balancing is not spin balancing, and yes, a good eye can detect a bent rim with a spin (but not always).
Dynamic (computer aided) will catch it every time.
FYI: I too am a trained auto tech. Held a NIASE (before they changed it to just ASE) master tech cert before I let it expire when I went into construction equipment.
I still keep up.
