My lectures are designed to supplement learning that my students are expected to have done prior to class. The lectures are a summary of the material, with worked examples, a chance to ask questions to clear up misunderstandings, and for discussion of key concepts.
Lectures are attended by dozens of students, so they cannot be a personalized tutorial service. That's what office hours are for. My best students don't usually need office hours as they are pretty much self-taught, but the next tier down show up regularly and we sit down together and go through exactly the material they want to focus on in the detail they need.
I tailor my pedagogy to these engaged students, not to the ones who expect to be handed an A for a minimum amount of effort. If you don't work, you'll deservedly do very poorly, and I'm not willing to waste my limited resources on you. And, no, I'm not going to curve your grade up either, because that's not fair on the good students.
Unsurprisingly, poor students don't show up to office hours, don't take advantage of our free tutoring service, turn in material late, and regularly miss lectures. All these failings are entirely their own responsibility, not mine.