Apropos of nothing, except that it will allow me to vent a bit, it also changes the rule for the pronunciation of the last consonant of French words.
Normally the lack of a trailing "e" would mean the last consonant is not-sounded but the diaeresis changes it: maïs/"my-isz", Noël/"noh-ell", etc.
And yes Moët (the champagne) is pronounced "moh-ett" in France and by French speakers.
It's incredibly annoying having someone subtly but in a slightly superior manner "correct" your pronunciation by repeating the mispronunciation right after you've pronounced it correctly - "sure, I'll order some some MOHAY". Outside I'm smiling and nodding pretending not to notice, inside I'm screaming "IT'S MOH-fcking-ETT MTHERF*KER - MOH-ETT."