If the battery greatly damages itself by charging past 80%, then the device should be aware of that and accommodate. I should never have to set an alarm to unplug my phone in fear of destroying it. This isn’t the 90s, where we tried to avoid over-charging Ni-Cd batteries. Making it work for the lowest common denominator is the only way to do it.
If, you know, you’re a company that doesn’t want your customers to buy more of your stuff. Yay e-waste.