The comma is a soft pause. We do this all the time in spoken language in order to break up an otherwise potentially ambiguous or hard to understand utterance, but it is basically dialectal. In writing that purposeful pause because a comma.
You can then analyze when such pauses are used in formal language, and infer rules for their use. But those rules aren’t going to be 100% consistent, and a violation of those rules is not a grammatical error in the sense that subject-verb disagreement would be.
TL;DR you said “majority” not “every.” That distinction is key.
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The comma is a soft pause. We do this all the time in spoken language in order to break up an otherwise potentially ambiguous or hard to understand utterance, but it is basically dialectal. In writing that purposeful pause because a comma.
You can then analyze when such pauses are used in formal language, and infer rules for their use. But those rules aren’t going to be 100% consistent, and a violation of those rules is not a grammatical error in the sense that subject-verb disagreement would be.
TL;DR you said “majority” not “every.” That distinction is key.