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Different batteries have different recommendations. It’s just that simple. Tesla used to recommend 90% and then the modified it to 80% - most likely for CYA and also so customers can’t get the most accurate read on their overinflated range estimates. It all depends on the battery’s architecture and materials used.

And honestly, if you’re not planning to keep the car more than 6-8 years, as long as you’re not maxing out and depleting the battery every 24 hours, you won’t do any truly significant damage whether you charge to 80 or 90. Not sure I agree with charging every day, but the car companies know way more than I do.