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Knowing working voltages has definitely helped me out in the past. As a slight aside, not knowing them has made me [against my will] read up on various 'black box' components and eventually figure out some of what the circuit should be doing in order for the component to do it's job which has led me to an error.
So yes, pin voltages for stuff would help. Certainly for us non-electronics types and general n00bs (and common all garden eejuts like me :) )
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