Why do the adults speak that way?

Kristi Luv: "Right and I hope that if they choose to make new Charley Brown shows that don't try an modernized it by having real adult voices! It would take away from the original C Brown!"
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Its already taken place.

I knew early on, even without having to be told, that the adults going 'muah-muah' was to keep the focus on the kids, but it seems the opposite effect happened and many people notice the noise right off if they hear it, say a trombone played, 'hey, it's Charlie Brown's teacher!'

But there have already been shows, much later ones, that had adults shown, tho this time to the barest minimum.

The biggest omission of adults I always noticed was in Valentines Day, when Miss Othmar and her boyfriend are leaving. Even tho they walked around the back of the car, then they must have pulled away in reverse, cuz we never see any legs or anything.

Not that I'm complaining, mind you.

But there was a later one where I think Charlie Brown and Sally are buying something and you hear the cashier give them the price, then see her hand it to them, her hand only.

And they go to Europe and we see a French cabbie or busdriver, a Frenchman depicted on an advertisement (just looking like a grown up Peanuts character tho).

Nightmare Charlie Brown, we saw the eskimo's shadow. I let that one pass, but it has gradually evolved since then.

The parents and adults are still never shown or heard, but they have appeared. These examples I noted, they are well over twenty years old, if not older.