To have a proper answer please do:
1. Get a degree in the field of science, math and engineering
2. Become an expert in what you do
3. Apply for work at apple
4. Become a leading technical expert at apple
5. be part of the creative team that decides what is good and what is not for ios and apple hardware
Then you'll have the answer to the question that you posed above.
Let me fix that for you...
5. be part of the marketing team that decides how to extract as much money as possible from the infatuated masses.