The Toyota Corolla sells 1 million units a year worldwide - it's totally practical and realistic to set up a production line to make 1 million devices a year.
Apple sells 200 million iphones a year.
That's why they're happy to make the iPhone 16, 16 Plus, 16 Pro, 16 Pro Max and 16e and offer them in 4-5 colours per model as well.
It's something else - probably sales.