Is this obviously a bad thing? My understanding of the argument for tenured faculty teaching courses is that tenured faculty are (or have been) actual researche

Is this obviously a bad thing? My understanding of the argument for tenured faculty teaching courses is that tenured faculty are (or have been) actual researchers in their field, so they have deep knowledge. But I'm skeptical that deep knowledge is really necessary to teach random undergrad courses. Seminars, sure. But since the number of people going to college has also grown since 1975, it seems...reasonable? to hire more teaching faculty.