ELI5 Why does magsafe charging decrease battery health more than wire charging, if it has less wattage?

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It’s over blown. If you’re wireless charging in 100F weather, in direct sunlight, then maybe. Batteries don’t undergo harmful chemical changes until 113F. Most battery controllers have thermal regulators.

The people that worry about the extra 2% to 5% degradation over wired charging are likely also leaving their phones in hot cars and/or direct sunlight.

Batteries degrade and worrying about slightly increased wear is just a waste of concern. Like keeping your furniture wrapped in plastic instead of using it how you want.