You're right that organizations do often become consensus-driven. It's a failure mode, not something to which we should aspire. And we certainly shouldn't tell people to deal with a shortfall of authority in an organization by becoming social slime balls that get their way through manipulating emotions and not atoms. People who advise doing this ruin good technologists by turning them into middling politicians.
"Disagree and commit" is a good thing. Escalating disagreement to a "single threaded owner" for a quick decision is a good thing. It avoids endless argumentation and aligns incentives the right way. Committees (formal or not) diffuse responsibility. Maturity is understanding that hierarchy is normal and desirable.