Nice post! I’ll try and come back with a more detailed reply later when I’ve got more time, but for now just one thing: Charging!
I’ve actually had a real quality of life improvement after switching to higher wattage chargers - I’ve been having way less problems with both an Anker 30W GaN charger and a Baseus 65W GaN charger.
Regarding heat and battery endurance: Remember to switch off WiFi/BT when you’re not requiring it. That Redpine chip can run hot.