That's an illogical and likely outdated perspective on battery capacity. I voluntarily charge my battery to 80%, both to prolong its life and because 80% is more than enough to meet my driving needs with only one charge per week. I also get a faster charge due to the taper of the power curve. 80% for me is 400 km / 248 miles of range, or 57 km / 35 miles per day. My commute to work is twelve miles each way. If my battery drops to 80% capacity over a decade, it won't affect me. I'd still have plenty of overhead with 400 km / 248 miles between charges.