This is just so wrong. English dictionaries are descriptive: they describe how the language is being used.
In 1961 people like you threw a fit that "ain't" was added to Webster's, despite its first known use over 200 years earlier.
English has no ultimate arbiter of "proper" use; it changes as people use it and dictionaries are a reference for how it is being used, not how it ought to be used.
Language is a living, changing thing. It doesn't matter how many grammar nazis oppose the changes, if enough people start using a word or phrase in a different way, that becomes the "right" way to use the word/phrase. "Nice" used to mean foolish, "meat" once meant food in general, and in my lifetime "gay" went from "happy" to "homosexual".
If you can't accept that language changes, you're gonna have a bad time.
I've been doing this and it has been helpful.
The main reason I tried it was that my snoring was bothering my wife and it only happened when I was breathing through my mouth. I also had my dental hygienist comment that I must be a "mouth breather" when I'm sleeping, despite not being one while I'm awake.
I use a Breath Right strip on my nose, and the tape I use only keeps my mouth from opening involuntary. I could open my mouth easily if I tried, so I'm not really worried about suffocating or anything like that.
It felt a bit weird at first but it has definitely curtailed the snoring, so my wife likes it. Maybe it's not for everyone, and some of the stories people tell about it seem pretty woo-woo, but it does what I need it to do with little trouble.