Earlier quoted context omitted.
Given the amount of evidence you presented, how could anyone refute your opinion? OP raised a valid argument - Apple's QC has been crap lately and trending downwards. There's a lot of feedback out on the net to support that line of thinking.
There's been Apple-bashing "feedback out on the net" since Apple was founded. Most of it has been laughable. The stuff you're talking about is firmly within that laughable camp. If Apple's QC were "crap" you'd see that in customer satisfaction ratings for their #1 product: the iPhone. But guess what? You don't see that. And there is no downward trend.
https://www.macworld.co.uk/how-to/mac-software/how-stop-some...
Storing the full disk encryption password in plaintext on the disk?
https://support.apple.com/en-us/HT208168
How do you explain these except for atrocious and trending downwards QC?