For most people they are not using 100% of capacity every day. In fact large numbers of laptops are primarily used plugged in and just move from desk to desk. I

For most people they are not using 100% of capacity every day. In fact large numbers of laptops are primarily used plugged in and just move from desk to desk. In that scenario charging to 80% has no downside. The upside is that your battery may last longer. If you are keeping your laptop for longer than 2-3 years that might be worthwhile.