Let me explain what I have discovered as I am encouraged by Microsoft to exchange my 4th faulty unit for another.
When you send for an exchange you do not receive a new unit but rather a refurbished one. We pay for brand new devices but are given second hand in exchange. From what I can deduce, all the faulty devices are sent to a local warehouse in your country/region, in my case Johannesburg. These are not Microsoft warehouses but rather a distribution company. They are then repackaged into a white box and shipped out to the next poor victim. I doubt they are checked, otherwise why would they keep sending out faulty devices.
I have managed to get Microsoft to supply a new unit but I am declining the offer and rather trying to get my retailer to give me a credit as it is now beyond a joke.
I received my first unit at the beginning of December 2020 and have 72 emails relating to fault resolution. In almost every instance it is apparent that the consultant may not answer your questions but rather send the standard "try this. try that, exchange the unit" response.
There are forums on Reddit, Quora, at least 3 on Microsoft's own site plus many more citing thousands of complaints about the Surface Pro Type cover issues alone, yet Microsoft has no knowledge of any issues. Mine seems to be the only faulty unit.
I cannot believe that Bill Gates intended for his company to provide this arrogant level of services.