ROB, I never claimed that every Tanna and Amora knew every sod. In fact, I clearly said otherwise. What I did say is precisely what is clear from those gemaras, that Hashem has many ways of revealing information to Chaza”l. The important thing is that they know the correct facts to pasken; it’s not important whether it’s through personal experience or direct Divine revelation.
I don’t really think it’s important to define the term hashkofa; I don’t think we should assume we know better than Chaza”l in any area.
However, if someone thinks they know better than Chaza”l the severity of punishment deserved for a particular aveirah, that’s particularly egregious.