The right measurement can end an argument instantly.

Two people can hold opposite views for a long time when neither has a number. The moment someone measures the thing, the disagreement usually evaporates, and often both parties are surprised. This is why the willingness to go and check is worth more in a dispute than any amount of skill in argument.

When a disagreement keeps recurring, ask what would settle it. If there is a measurable answer, go and find it before the next round. Being wrong once with data is far cheaper than being persuasive for months without it.