After a long time of users asking, Valve has actually added an official Battery Charge Limit setting in the latest Steam Deck Beta update so you no longer need to use third-party tools.
The logic isn’t flawed, your priors are. You’re assuming that people are constantly on a cycle of charging their battery to the limit, running it down low, and then charging it again. If you mostly play docked or with a charger plugged in then capping the battery at around 80% prolongs the battery runtime for when you do turn the limit off and want to use the full battery.
If you mostly play fully charged and stationary, then lowering the charge limit means you have more future opportunities to experience the fully battery runtime when you disable the setting.
There’s absolutely no way a setting buried in a menu is designed to be constantly enabled and disabled based on when you’re using the device docked or not.
Otherwise, the toggle would exist in the quick access menu.
That’s also not how it works on laptops that offer it, so I doubt the idea is having users constantly toggling it.
The logic isn’t flawed, your priors are. You’re assuming that people are constantly on a cycle of charging their battery to the limit, running it down low, and then charging it again. If you mostly play docked or with a charger plugged in then capping the battery at around 80% prolongs the battery runtime for when you do turn the limit off and want to use the full battery.
If you mostly play fully charged and stationary, then lowering the charge limit means you have more future opportunities to experience the fully battery runtime when you disable the setting.
There’s absolutely no way a setting buried in a menu is designed to be constantly enabled and disabled based on when you’re using the device docked or not.
Otherwise, the toggle would exist in the quick access menu.
That’s also not how it works on laptops that offer it, so I doubt the idea is having users constantly toggling it.