[professorthread]

Some tenured professors slack on teaching, or were never that great at teaching to begin with. But tenure as an institution improves teaching quality. What professors teach is subject no less to academic freedom and the protections tenure provides than what professors research. Faculty subject to short-term contracts tend to have their contract renewal dependent on student evaluation scores, which study after study show are poorly correlated (and often anti-correlated) with student learning outcomes. Good teachers aren't necessarily popular; easy graders are popular. Conveying difficult subject matter that may be controversial or technically difficult to grok is crucial to learning outcomes. This is exactly what gets cut out when you lose academic freedom, become a cog of administrators who are out to maximize enrollments not learning outcomes, and have your job performance hinge upon student evaluations.