Ah, the old "you must work for Apple" gambit.
Look, go ahead, tilt at windmills if you want, I really don't care, it's your life, it's your time.
But basically a product is a product. If someone has had five "defective" products in a row, odds are the product isn't actually defective but rather people don't like the way the product is produced.
Products are made from components with tolerances; some may be one way, some may be another.
Often those tolerances are related to the cost of the component.
If you don't like the quality of Apple's products, don't buy them.
Here's a simple test - look at others of the same model at the Apple Store.
If others have the same issue, it's likely a design issue and it's likely just the way it will be.
If others do not, your unit is defective and should be replaced.
This isn't just an Apple thing; it's called being a consumer.
Millions of people rely on products from lots of companies, but if those companies start spewing bad products, the only way they will change is if people start buying other products instead.