Well I would assume majority of iPhones have been charged using the 5w charger. That hasn't seem to slow down battery degredation since Apple has been implementing updates to slow down one year old iPhones because of battery degredation.That power off function for the newer iPhones is odd. Don’t think that was done well. Amusing though that you’re reaching for such random arguments.
Nothing difficult to understand. For battery health, longevity and how 99% of users understand and charge their iPhones, a simple charger for overnight charging is sufficient. Though I do think 5W is on the low end. But something like a 20-30W charger would be overkill.
What’s funny is your inability to see outside of the MR niche bubble for what benefits the majority of users.
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Don’t forget to inform them of the impact to battery health when fast charging every single day.