I guess I just find it hard to believe there's faulty hardware across 3 different models and graphics cards rather than a bug in the driver.

Maybe the issue I'm talking about seeing isn't the same.

It could be something in their process that's rare but just happens sometimes. Heck, maybe it gets damaged in shipping. If it's uncommon enough and they do replacements maybe they just write it off.

Apple has been selling laptops with broken keyboards for years, not to mention all of the other problems caused by insufficient cooling.