A committee can distribute authority until responsibility has nowhere obvious to land.

Shared authority is often good and it has a failure mode. Once enough people have a portion of a decision, no single person owns it, and when it goes wrong there is genuinely nobody who could have stopped it alone. Everyone acted reasonably within their part. The harm still happened, and the structure has quietly made accountability impossible without anyone intending that.

In any group decision, agree at the start who owns the outcome, not just who contributes to it. If you cannot name that person, the structure has a hole in it. Naming an owner does not reduce collaboration, it just means someone is watching the whole thing.