The thing about the 2012 election though is the polls were tight. The most favorable Romney Poll was Rasmussen (R+1) and Gallup (R+1). The most favorable Obama poll was (D+3). That’s a 4 point spread on all the polls. Today the polls range from +2 Trump to +12 Clinton and all in between for a 14 point delta - more than 3x 2012. Either there was more herding in 2012 or polling has gotten less accurate (or both)
I think that’s based on an average though. Not a snapshot of what the polls said 2 weeks out. I don’t remember them being that far apart myself though.
But like you said, I think the ones showing a huge Clinton margin are the more questionable ones. They’re predicting something unusual if not unprecedented. They have the bigger burden of proof. Even Obama/McCain was a 7.2 victory margin. And that was with Obama being a fawned-over, beloved folk hero and McCain getting the entire market crash hung around his neck.