Asynchronous communication also allows for thoughtful considered responses to others’ ideas over time, unlike face-to-face communication
The nature of asynchronous communication and interaction opens the door to true reflective thinking over time. While this type of reflection does occur in face to face courses, it does so in a different way. In the online setting, the students and instructors can easily review posts, resources, and types of interactions to then present a fully-considered opinion or reflection. Conversely in a face to face class, the students usually do not have access to all of those factors instantly the way it happens in an online course.
Again, this is not to say one is better than the other. It's to acknowledge the advantages and disadvantages of each setting.
In the face to face environment, students who are more extroverted can still engage in a manner that brings them joy and satisfaction. At the same time, students who tend to be more introverted can experience that same sense of joy and satisfaction as well.
I see the reflection aspect of the online course as being connected to the learning strategy of spaced repetition. While it can and does happen in face to face classes, it occurs in a different way in the online setting -- but the important part is that it can still occur.