Still, having this option can't be a bad thing. Ultimately it's an engineer (or PM I suppose) that decides to use this chip based on the product requirements.
Sometimes you want to fail closed, or purposefully fail catastrophically if some constraints aren't met.
So the proper Cantonese way (typically a Cantonese last name, there are a bunch of us cantos in Viet Nam as well), is that it's basically "mmm". If at the beginning of a word you don't have to close your lips.