The stat about AI email subject lines that caught me off guard

I was digging through a marketing report from last month and found that personalized subject lines only beat generic ones by like 4% when AI writes the whole email, not the 30% I kept hearing about. The report said it was because the AI used the same tone for everyone, so it felt robotic even with the name plugged in. Has anyone else seen data like this, or was I just looking at a bad sample?

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