I apologize, everyone. Coming from a "company such as" Apple, this erks me...
The company I used to work for does this. Hardware Engineers design, Software Engineers fix...
BTW: All you people with defective screens your chances of taking it back just went way down...
Yep. Coming from the POV of someone who works for a hardware manufacturer (nothing anywhere near as exciting though), I can see where this post is coming from. It seems (very) possible that the faulty screens are still faulty, but the software patch applies a correction that compensates reasonably for the fault and makes it look ok.
The old car analogy: it's like if you buy a car that can't keep in a straight line, but the manufacturer installs a computer chip that stabilises it. The fault is still there, but you don't notice it, therefore it's "fixed".
To a manufacturer, it's uncomfortable, but from the consumer's point of view who cares, it works.
As long as people are happy it doesn't matter