This category of advice is usually what I run in to when I'm evaluating things at all (people rarely trust me with secret wisdom, but they often trust me with merely advanced wisdom :))

As a metric, I'd suggest a variant on #3 works: is there some reason to suspect that YOU have a special level of competence that grants you unusual insight? And then ask equally why is it being shared? Is it because it's useful at all levels, or because your instructor trusts that YOU are clearly an advanced student, who can understand these things?

Or is it simply because it's a high-status platitude that will encourage people to start thinking for themselves, then credit the platitude for their success? Or perhaps it simply serves to keep you practicing, and practice tends to bring improvements! :)