I think some people want to turn weekly Church into the equivalent of a graduate level seminar (or at least a senior capstone course).
Even though I have a PhD and love intellectual discussions, I can’t think of anything worse. The gospel needs to stay “small and simple.”
(I’ve seen a few mainstream Protestant denominations that do treat Sunday school like a graduate seminar; That’s one reason those denominations are dying off, though it’s more a symptom than the cause).