It is absolutely too much work. It's incredibly easy to get bogged into the weeds of config stuff like this and almost no one will care. if they did, I bet it's turn into a cluster of hearsay about magic settings that make almost no practical difference.

Also, I'd argue it's not obvious that 80% charging is better for most people. You're taking an immediate 20% cut to battery life, and chances are it will take years for it to actually be better than charging to 100%. I guess it's good to have the option, but only if you almost never need that last bit of capacity.