Split twelve participants into two groups and two discussions can run at the same time. More people get a chance to speak. Two topics can progress instead of one.
Spoken discussion does work well in small groups. So why not keep dividing the workshop until every breakout is small enough for turn-taking to work naturally?
Yes. Breakouts create more conversations. But they sacrifice the shared reasoning needed for deeper understanding.
Breakouts split the perspectives.
Each discussion needs enough of the relevant knowledge and perspectives to understand why an issue has priority, why judgments diverge, or what sits behind a problem. The smaller the groups become, the more likely it is that someone holding an important part of the picture is sitting in another breakout.
Each participant can also take part in only one breakout discussion at a time. Their knowledge and perspective are therefore available to one topic at a time, even when they would matter elsewhere. The more the workshop divides people and topics, the more likely it is that expertise and insights are missing elsewhere.
Moving between breakouts does not solve the problem. First, participants cannot know when and where the need for their perspective will arise. Then, a participant arriving in another breakout has missed the reasoning that brought that breakout to where it is. The group may need to recap, the newly arrived participant may repeat points already made, and the participant may be missed when their original breakout needs them again.
Breakouts fragment facilitation.
The person running the workshop can follow only one breakout at a time. In the others, they cannot see when a discussion stalls, drifts, gets bogged down, or needs help moving forward.
And someone usually fills the gap. It may be the most senior person in the group. It may be the most confident or simply the most vocal. Before long, the breakout has its own informal facilitator—and the hierarchy or dominance patterns the workshop was meant to manage creep back in.
Reporting back loses the reasoning.
Whatever the groups develop separately then has to be brought back together. Each breakout needs to prepare what it will report. Those reports happen one after another. Two breakouts do not simply double usable discussion time. Add more groups and the reintegration burden grows with them.
Conclusions can be summarized. Much of the reasoning, qualification, challenge, and context that produced them stays behind. So does much of the deeper understanding the discussion was meant to create in the first place.
That is the Catch-22. The richer the breakout discussion, the more there is to lose when it is compressed into a report-back. If the plenary has to reopen the reasoning to recover that understanding, still more of the apparent time gain disappears.
These issues compound. Breakouts cannot simply be multiplied until spoken turn-taking works comfortably in every group. Smaller groups improve the conversation mechanics, but progressively weaken shared access to people, perspectives, and context—and consume more workshop time trying to put the pieces back together.