"Apple no longer reports iPhone, iPad, and Mac unit sales numbers..." Probably because they only care about revenue and profits these days, not innovation and products. Apple didn't get to where they are by optimizing the supply chain but by coming up with incredible products that everyone HAD to have. I bought an iPhone last spring because it was the least-bad option in my opinion; if the Librem 5 is a flop I don't…
Apple's supply chain used to have some really bad inventory turnover numbers. Unsold inventory would literally sit in warehouses depreciating in value, costing the company lots of money. You might be interested in reading this piece on Tim Cook's changes to the supply chain:
https://money.cnn.com/2008/11/09/technology/cook_apple.fortu...
It's either misguided or completely dishonest for you to assert that Apple's supply chain management plays second fiddle to its products when it comes to their success as a company.