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The higher mg caffeine / mL of coffee mitigates that a bit, probably so it's 2x as bad instead of 4x as bad.

Really? I don't drink coffee, but do drink tea, and I'm pretty sure that people drink them for reasons other than the raw caffeine content per ml.

Yea, but a lot of people use it simply as a drug delivery vehicle. Getting n mg caffeine into your system is the goal for some folks.