This is a problem for everyone. People may not experience the struggle directly, but it's there. It's the inherent problem with any group class.

> I feel like there's always the tendency for people to zone out and not raise an issue when they are either bored or did not keep up/understand.

Tight loops of interaction will make this nearly impossible. What you'll have to watch out for instead is overwhelming students to the point of distress (speaking from experience).