I had the same sort of thing that your DH experiences happen to me in the English department in which I taught while I was working on an advanced degree. I demanded a lot of the students, I was a tough grader, I required attendance (and did everything I could to make attending class necessary for success, not just a waste of time), I harshly penalized late papers, and I always asked more of the students who could give more. I consistently received high marks on student evaluations and received a teaching award along the way. More importantly, ALL the students' reading and writing skills improved, even at the tails of the curve. That was very important to me.
Students generally live up to--or down to!--what is expected of them. I firmly believe that!
And BTW, even though I'm a recovering English major, I'm married to a chemical engineer. I LOVE the batch process/just-in-time process analogy!

Very apt! And totally on point for the quality control issues that the schools so often focus on and/or sidestep, depending on how it suits their purposes...
Thanks for that!