I can see the scene in my mind, because I've lived it - some middle manager arguing with his programmers:
Middle manager: Why would anyone EVER want to not remove this noise floor? I can't see why you want to make it an option!
Tech dude: I don't really know, but when you have a new feature, you need to make it at least disable-able so it can keep doing what the customer has always done.
Middle mangler: Seriously, it just removes eating noises and chirps! Nobody wants that!
Marketing dweeb: Er, I shouldn't know this, but eating noises are a desirable market segment for some ...
Middleman: Ah, fuck it, sure leave it as an option, but make it default on.