No EU airport allows this for flights from outside the EU/Schengen zone. Every international airport has dedicated "EU internal" and "all other" terminal pathways for this reason.

Yes, they do. Unless I misinterpreted your comment, connection flights from outside EU to US/Canada don’t require the Schengen visa as passengers don’t leave the “clean” zone.

I've had to go through security and immigration when flying through Dublin and Seoul. So I don't think you can exempt Europe and Asia from the list.

Were you flying to or from somewhere else in Europe in the Dublin case? A subtlety about this which has just come up elsewhere in this thread is that the whole Schengen Area is treated as a single "country" for immigration purposes, so if you have an intra-European flight, you have to enter or exit "Europe" in the course of a transfer to or from an external flight.

But I think if you fly, for example, from New York to Paris and then on to Tunis, you don't have to go through immigration controls in Paris.

I was flying from Seattle to Rome with a connecting flight in Dublin. In both Rome and Dublin I had to go through immigration (that is, present my passport) and in Dublin I had my carry on X-rayed again. Upon arrival in Rome, after clearing immigration I had to go through customs, which is to say I walked out the "Nothing to Declare" portal.

Oh, I just remembered that Ireland isn't in the Schengen Area (due to the Common Travel Area with the UK). So you wouldn't have a domestic-style flight from Ireland to Italy. But your experience then does seem to confirm that Dublin doesn't offer sterile transit at all, which is a bit of a surprise to me.