>Setting up custom email filters is beyond the capabilities of most students?

Yes. And most of the general population. They can do it once they know it exists, most people just are not aware it is a thing at all.

>What are they learning?

Here, their "major" as you say in the US. Someone in econ, biology or even CS is not going to learn Outlook rules. Maybe IT or business will have a sentence on it.

>Where will they be qualified to work?

Any office job. Any job really.