How do I do meaningful work under impossible deadlines?

You care about how people truly learn, and you keep getting handed rushed content and deadlines that make real learning impossible. That frustration is not you being difficult. It is the gap between the standard you hold and the room you are given. That gap is painful precisely because you care. You cannot always control the deadline or the material. But inside those limits, there is almost always a small choice that serves the learner: one clearer example, one better question, one thing cut so the important part lands. Aim your energy there. Do not spend it all raging at the parts you cannot move. Let go of perfect, and protect good. A learner helped a little is better than a masterpiece you were never allowed to make. Pick the one improvement that fits the time you have, and make it well. Over many projects, those small wins are a real body of work, even inside a system that rushes you.