a moot point

US /ə muːt pɔɪnt/
UK /ə muːt pɔɪnt/
"a moot point" picture
1.

un point discutable, une question controversée

a subject or question about which people can argue or disagree, or about which it is not necessary to make a decision

:
Whether the new policy will actually be effective is a moot point.
La question de savoir si la nouvelle politique sera réellement efficace est un point discutable.
His guilt is a moot point, as he died before the trial.
Sa culpabilité est un point discutable, car il est mort avant le procès.