Code reviews are not only about raising quality, but mainly about communicating changes to the wider team. Suggesting to eliminate code reviews when LLM use is so rampant is also quite uhm courageous.
Asking questions on code reviews is one of the most powerful tools to learn more about a codebase, and fostering a culture where junior devs feel empowered to ask questions is one of the best ways to help junior devs succeed.
But I fully agree that for juniors it makes sense to have it mandatory.