Which is totally backwards, as these classes are the point of contact where energetic, motivated new students get that magical passion that pushes them into an entire life in the field. When I was in grad school and expressed a desire to focus on teaching, primarily 100 & 200 level courses my supervisor said "that's the punishment we reserve for those who are failing in their research". Totally crushed my desire to work at converting tangential students into future leaders in our field.