I believe that this is yet another case of middle ground being the best: leave the bulk of teaching to specialists, but keep the research professors doing cours

I believe that this is yet another case of middle ground being the best: leave the bulk of teaching to specialists, but keep the research professors doing courses close to their actual field. Don't underestimate how educative teaching can be for the teacher. But this is certainly no big insight. Or are there places that do not, at least to some amount, do it like this?