I've had two-stage snowblowers for maybe twelve or fourteen years. In all that time I think I've broken and changed one shear pin. And I get a ton of wet, heavy stuff and ice the end of the drive.
It would be nice not to have to deal with that, but at least for me it's been a virtual non-factor.
Now I know!
(and knowing's half the battle) ...
Found this very boring yet informative video on the topic: