This is like asking "what's the point of not allowing students to use Google during their Maths exams" or "why bother with English exams when Grammarly exists".

The point is to gain some knowledge yourself. Obviously you'll use new tools and methods later when you eventually get a job, but the point of most courses is to teach you the concepts, not how to command the IDE. Whether you decide to hand-craft assembly code or become professional a Copilot suggestion approver doesn't really matter.