I've typed out and deleted my response 3 times because I just do not have the effort to respond to what you just said. Open your eyes.
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...and yet they won't because they seemingly fail to prepare year on year regardless of the fact they know definitely know a minimum number of iPhones they are guaranteed to sell. Other companies have enormous launches, and they all manage to supply stock pretty quickly. No idea why Apple, with all their power and wealth, fail to get this right year on year.
Well, I have the energy, so here goes. Other companies manage to supply enough stock because they don't come close to the runaway best sellers that Apple has. Now, again you ask why, since it knows it has the world's most popular phones, Apple doesn't simply double, triple, whatever, factory capacity to have enough phones on day 1 to meet peak demand. Tim Cook must be a dunce! It sounds so easy and so logical, until you consider basic business production principles.
To use a simple analogy, let's look at an example that you likely have where you live. You have a popular restaurant that has long lines on Friday and Saturday night. You probably wonder why that restaurant doesn't simply triple the size of the restaurant and the staff so no one has to wait. The problem is that the owner is going to be paying rent, insurance, utilities, etc., on that extra square feet every day of the week when it is empty. They are going to have to purchase expensive ovens, etc., that will be largely unused. They are going to have to pay staff that they don't need most of the time. Now, of course the smart business owner will always be looking to see when it pays off to bring on some extra part time staff, or pay overtime, or even consider expansion, but it always boils down to a cost benefit analysis of whether those extra costs and headaches are going to be exceeded by the additional revenue.
To bring it back to Apple. Tim Cook's background is precisely in this area and what Steve Jobs relied on him to handle. Cook/Apple expends millions to understand the market conditions and make predictions on what demand will be and when. Apple then has to work with it's suppliers and make billions in commitments/orders for various parts and production lines. Think how complex this is when each year Apple is facing not only different market forces, but they are incorporating new technologies that require entire new assembly and production processes.
You and everyone else that wants every product in every color, size, etc., in stock on day 1 so you never have to wait would, of course, want Apple to simply make it happen, but that would mean paying the extra billions to Foxconn and others to build more factories and hire hundreds of thousands of more workers. Even if were simply a matter of increased assembly capacity, it would be a disastrous and insane business decision to waste those billions to meet peak demand simply to eliminate any wait. Of course, even if Apple didn't care if it made business sense, i't isn't as simple as increasing assembly capacity like in our local restaurant example. Each year Apple has multiple companies producing Apple's latest technologies, e.g., screens, chips, etc., and each of those have their own productions challenges.
Hopefully, that makes it easier to understand why Apple can't simply have all the phones everyone wants on day 1. It's a nice problem all of the other companies, Samsung, Google, etc., would love to have --when hundreds of millions of people want your phone each year.