I think one needs to understand the correlation between
Vehicle mfg cost
Vehicle Design tolerances
BMW Groups's bottom-line and Porsche's Bottom-line
If you can grasp all of that information and understand the crucial connections btwn each, then the argument about how the vehicle is unreliable or reliable in certain MY vs others really makes sense.
BMW and Mercedes Build Beta Products!
Lexus build Release Candidate Products!
Why does this matter?
CAUSE EVERY TIME someone says Lexus has better build quality, one should consider what Toyota their Lexus Engine and chassis platform comes out of and how long that part has been tested in the real world!