Interesting Guardian article "The meaning of ‘moot’ is a moot point – whichever variety of English you speak"
moot remains a lovely and versatile word, equally at home as noun,
adjective or verb – and with contrasting meanings, depending on which
side of the Atlantic you are using it.
a moot point, initially a legal issue, became used more widely to mean
one that was open to argument, debatable or uncertain. The author
Gerald Durrell used it in this sense when he wrote: “Whether he could
have bitten us successfully ... was rather a moot point, but it was
not the sort of experiment I cared to make.”
Today, I think most British English speakers would use moot in this
sense, or as a verb to mean proposed (“Banking: plan mooted for merger
of trade associations” ran a typical headline this week). It’s a
different story in the United States, where since the 19th century a
moot point has been one that is at best academic and at worst
Mind your language - moot point (The Guardian)