When a Tesla bursts into flame due to a bad battery bought on eBay, which do you think makes the news.
Tesla car bursts into flames while parked in garage
or
Offbrand battery purchased on eBay bursts into flames
It makes 1000% sense to not support this. And I bought a Tesla knowing full well anything past tires/brakes is going to require Tesla to be my repairshop of choice. I can't shop it around the same I can my Honda. And the tradeoff was worth it to me. Early signs point to the battery lasting 200k miles, which should outlive the car.
A fully integrated cell-to-pack architecture where the pack is fully integrated and structural is clearly the best solution for a car.
Otherwise you are just having millions of car driving around far heavier and less efficient then they should be.
This assumes it would be impossible for telsa engineers to design around modular cells. And I don't think that is a fair assessment
You simply can not replace individual cells or individual models.
The level of replacement is a the whole battery pack. Anything else makes very little sense.
Your model is basically, putting a box in a box in box and then adding a huge amount of complexity on all layers to make it possible to cheaply disassembly. You are gone have a far heavier car, that is far, far more complex to build and far more prone to actually breaking.