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Re:MacBook Pro 14-inch and MacBook Pro 16-inch by anamexis on Monday October 18, 2021 @10:13PM (#28914130)
Voltage negotiation matters, because that what keeps a charger from putting 120 volts into your MacBook.

Which is exactly what GP was saying in the very part that you quoted:

> chargers and cables are advertised with the wattage they support, but it's really the voltage and current that matters.

and what you agreed with in that very same comment:

> Also, it arguably does have everything to do with volts

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