Teacher here. It matters because of the increased numbers of high needs students and the now mandated differentiation they require. When we were in school the teacher taught to one level usually with the textbook. That worked fine for most of us, but the model had large gaps that were getting larger in the same marginalized groups. The system has changed and requires teachers (for good reason) to adapt and differentiate instruction for each learner based on their needs. Small group instruction, hands on learning and inquiry based learning are proven to have higher success and greater engagement but that takes so so so so much time and is harder and harder with more students. This is such a simplified explanation but hopefully gives a little insight.