The main reason internships are beneficial is the corporate experience.
Colleges teach you some skills. These are often outdated or not really applicable in a real business context.
While there are certain “team projects” every now and then, it’s nowhere near the actual scenario of participating in the production, planning, strategy, collaboration, and execution which you can do as part of the benefits of internships.
Of course, some firms are better than others. They may have designated mentors or a training or onboarding program for interns and entry-level folks. Sadly, this isn’t as common, but any company would do better than none.
Throughout one’s career, applying industry skills, communicating with team members, and following business objectives are always applicable. Gaining experience at two or three companies helps to determine what’s common in business and some of the best practices interns need to apply once they land a real job.
Let alone the fact that top interns often receive permanent offers being one of the benefits of internships for many interns. It is far easier than going through interviews.