They talk about Apple but Sony phones have had this feature for a while. In the settings you can choose whether the phone is always 100% charged, or whether it charges to 80% (or a custom %) or whether you want it full by the time you wake up.

I use the 3rd option. It stops charging when it gets to 90% and I tell it when I'm getting up, and just before it will charge up to 100 %.

Best of both worlds. Only ever having 80% to start is not nice because you get less juice during the day and need to charge by the evening. Plus battery anxiety. I'd rather have a 100% full battery.

Clearly newer, better battery tech is needed. Plus replaceable batteries.