Extension or no, university courses (especially undergraduate courses) are often taught by underpaid lecturers, adjuncts, and grad students, sometimes hired on

Extension or no, university courses (especially undergraduate courses) are often taught by underpaid lecturers, adjuncts, and grad students, sometimes hired on a term-by-term basis. This isn't necessarily a bad thing for students. At research universities, there is little reason to expect that a tenured faculty member would actually be a better teacher than some random lecturer; faculty are incentivized for fundraising and research rather than teaching. Moreover, experienced faculty may have little recollection of what it was like to actually learn the course material before it became second nature to them. Courses typically cover the same material, and the syllabus is usually about the same, irrespective of instructor.