I will not dispute your postings.  I have no info to prove you wrong.  However, coming from the computer industry, know that common components are used in a lot of computer systems.  But the top line companies spend a LOT of time and money testing and certifying components.   A disk drive, for example, can come from the same factory for many makers, but the top companies will have tested the firmware on the drive and in many cases rejected it, insisting on changes or fixes.

Drives will be qualified with controllers and OS revs.

The smaller companies don't have the resources to do this, so they sell cheap and hope for the best.  No disrespect intended but it costs a LOT to provide the level of support the top companies provide including testing, stockign parts, documentation and training of their staffs.   That cost is reflected in what they charge.

So, yes, two disk drives can come out of the same factory, but the customer experience can be quite different.

So, I would imagine, it would be with these components too.