Insufficient testing at today's Apple is not limited to software. They bragged about their extensive input testing lab [0] when the new line of Magic accessories was released, but the Magic Keyboard with Numeric Keypad launched last summer had all of its inventory pulled from the channel last month because users discovered that the model was so thin that its midsection bowed over time.
[0]: https://medium.com/backchannel/what-i-saw-inside-apple-s-top...