That's somewhat over the top, don't you think.

The vibration usually fatigues the metal in the mounting bolts long before the big thick hardened shaft even thinks about fatigue. And the bearings would take the grief before the shaft anyway.

I can't remember all the numerous times I've seen bolt heads snapped off. What beat them off....... you think it might have been vibration?

And what caused that vibration? The normal engine vibration? yeah, sure........

Check your props for balance, beginners. It's a sensible thing to do. It might just save you an airplane some day. Might save you popped mounting bolts or allow your RXs to grow old gracefully.

You cannot predict when or if a prop mfg has a bad run of props. Think they won't ever make an out of balance prop, or that you won't be the one to buy it?

BTW, if you are the beginner who knicks a prop on landing, you'll have a prop balancer to use to see if the prop is still usable. And the experience to use that balancer properly.