Apple is in consumer electronics! Cheap, cheap, cheap! Stamp them out with a cookie cutter.
THE APPLE IPHONE IS NOT DESIGNED TO BE REPAIRED. PERIOD! IT IS DESIGNED TO BE THROW AWAY!
And you are just an economist who knows nothing about the intricacies of electronic equipment — from design to manufacturing. You are good at cutting and pasting, though.
My background.
1. I worked in design, designing high reliable/available electronic systems. I had to design systems that would tolerate high temperature (and low temp) environments. I designed, simulated, and tested these systems with the goal of predicting and achieving high reliability and high availability. Yes, we used batteries.
2. I worked in an ASIC (complex integrated System On Chip) development group and one of our production release deliverables was reliability calculations and predictions based on accelerated life testing — HTOL and Temp Cycle.
3. I now work for a manufacturer who assembles and tests simple and complex electronics assemblies from low volume to midrange volume. And I know all about field return units and RMAs and the process for cycling RMAs and field returns back to the customer and it is a fact that no functional test is good enough to capture all field return failures. So, swapping a known good unit (with a bad battery) is risky at best. NO, APPLE WILL NOT SWAP A BRAND NEW UNIT WITH A USED UNIT WITH A DEAD BATTERY. APPLE WILL ONLY REPLACE YOUR UNIT AND WILL NOT REPAIR IT. I KNOW FIRST HAND BECAUSE I TRIED.
Keep dancing. Apple provides repair parts for their Authorized Repair Locations. If the product to be repair were intended to just be replaced under warranty, there'd be no such need for repair parts. You don't have a clue about Apple's practices that make it and its products the best in the world. You are talking about companies who are chasing profits by selling the lowest priced commodity products and must eke out every fractional cent from manufacturing possible. Apple does not have to do that.