User replaceable batteries would be actual cheap, would be nice. But iPhone 15 pro battery replacement at Apple is $100, and I’d expect that to be one of the more expensive battery replacements. Many phones will be cheaper, third parties will be cheaper. While I’d rather do it myself, it’s really not that much for once every three years to keep it above 80% health, and 9% of phone replacement cost.

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 reduced range on normal days, you want max range available for road trips, and replacing the battery is very expensive