Sad to see go-shows becoming less of an option... though, I thought this was determined by each fare's T&C's before as well?
[Off-topic]I am not sure MH does MH-coded BC bookings on the SQ/MI flights anymore? There used to be this option a few years ago, circa 2015, but it appears this arrangement is now focused on Y.
Perhaps someone w a EF Premium account can help validate... happy to be shown otherwise, as certain MI flights make for much better connections.