the argument of “why would you try to save your battery by not using it when it has the same net effect of less battery?” is pretty short-sighted.

The argument is

• why try to save your phone battery when it’s critical to last the day and eventual replacement is cheap?
• it’s much more important to save your car battery because you won’t miss it on normal days, you want max range available for road trips, and replacing the battery is very expensive