I’m not sure that knowing about Æthelred the Unready is particularly useful for most jobs, but if you think of these classes as (covertly) teaching critical thinking and writing skills, then perhaps they make some sense even if you don’t value knowing about the world beyond your particular specialization.
But are they actually teaching critical thinking successfully? And why would you need to wait until college for those effects to show up? The humanities classes are taught throughout regular schooling.
The community college where I teach has English 001C: Critical Thinking/Composition -- “This course presents the elements of critical reasoning and logic. Students will learn to identify the basic structures of arguments and the ways people use language to fortify or to falsify arguments. Students will analyze and demonstrate these techniques by writing and critiquing essays and using research strategies.”
So, does this course actually work at instilling critical thinking in students, outside the narrow classroom setting? Does this effect persist over the long term? Is it better or worse to teach this in the context of composition, or something more domain-specific, e.g. economics/government policy?
I feel like people making claims that education that students don't ask for is useful have the burden of showing that it is does what they say it will, empirically, and not get to hand wave about "critical thinking" or "well-roundedness".