A lot of these large companies spend millions of dollars recruiting participants from various demographics to test prototypes and fine-tune technologies like this. It's a tremendous effort.
Also such a thing as being too conservative with battery size (iphone 6?) so that when it unavoidably degrades, you must throttle down the phone to avoid killing the battery and perhaps more (literally by a current draw it can't handle since the internal resistance has increased).
And that's just apple, then there's unintended acceleration (toyota), exploding airbags, faulty ignition (ford was it?).
Don't think that just because they are large, or a company, or old, or whatever, they always have their shit together. Companies are people. People make mistakes. Mistakes can slip through the cracks.
It kinda makes sense that some of her traits would be covered inside the test pannel, but looking at the face unlock and the level of adjustments they're still doing, it doesn't look like they got nearly enough data before launch. And that's for a product that is selling in billions of units.