The primary claim is "I think it's fine for most teaching to not be done by full professors." Adjunct jobs as they currently exist suck, but part of the problem is that they are staffed by people who are arguably overqualified and had much higher aspirations
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https://bsky.app/profile/heissenstat.bsky.social/post/3l3s5qsae5z27
You don't need a PhD when what you are primarily doing is teaching undergrads.