The proper use of commas is often more art than science.

My theory is that, just like with omitting a final comma in a list when not essential for meaning, publishers are trying to save paper and ink or pixels on-screen.

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On occasion I omit commas. On occasion, I use them. (The more you know about English, the less you're likely to think there are unbreakable "rules" for a lot of these things.)

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