Use 'a moot point' when referring to debates or discussions that have already been settled.

Resolved Discussion

Emphasize the futility of a discussion when a situation cannot be changed, regardless of the debate.

Futility Emphasis

Highlight that the issue has no impact on the present circumstance, often because the event is in the past.

Point out when an issue has no practical consequences or cannot lead to any action.

In academic contexts, 'a moot point' can be an issue used for the purpose of argument and learning.

Law students use 'moot points' in moot courts to practice legal arguments and procedures.