How many of these MacBook Pro Notebooks have shipped ?
Tim said 4.2 Million Macs in one qtr but Apple makes a lot of different macs
https://www.macrumors.com/2017/05/05/tim-cook-strong-demand-2016-macbook-pro/
To Play with some numbers let's guess 100k 2017 15 inch models shipped
If 50% had QC problems that would be 50000 defects in the suppply chain
If 10% had QC problems that would be 10000 defects in the suppply chain
If 1% had QC problems that would be 1000 defects in the suppply chain
If .1% had QC problems that would be 100 defects in the suppply chain
And so on, and they have shipped A Lot of Machines.......
A lot more than 100k, so many in fact there are alternate vendors
For LCD screens, sub assemblies, chipsets, and such.
And I would expect from the Refurbishment Stream alone the overall defect rate on 4.2 million products in one qtr to be closer to .001% if not lower
And other Vendors get their parts from the same suppliers Apple does.
So the sky isn't falling.
Satisfaction is the goal in design, manufacturing, packaging, delivery, and support.