We can involve students in the process of curating content for courses, either by offering them limited choices between different texts or by offering them solid time to curate a future unit more or less on their own (or in a group) as a research project
Absolutely true, students learn by doing, so as they are involved in creating course content, they develop course development skills, which will enable develop a course from scratch in the future.
I believe most teachers are skeptical about letting undergraduate students be involved in course content creation or modification, but tend to let graduate students undertake these assignments.