Comparing a 5 series BMW with a Corolla is a very silly proposition. Calling the higher end cars 'beta testers' is quite an unreasonable mindset. yes, they may be the hot bed of automotive innovation, it doesn't mean that these are beta testers for a Corolla.
For example, my A6 has its own fiber optic network for its internal data communications. Audi did not put it there to test it on me so that they can then deploy it in Golf. If in 10 years they do start putting it in a Golf, it will be for trying to squeeze more life out of their R&D Euros.
But in the original post what we have is a big failure on BMW-s part and a little bit of a surprising behavior on the driver's part.