LOL so my statement was broad and you countered it with an even wider one? And I'm sorry but using Lincoln as a viable example is absurd, Infiniti is on record that they want to compete with the big german 3, not Lincoln.
Mercedes is sharing a platform because they bought into the alliance. This just proves my point further. The MFA platform is exclusive, no Nissans or Renaults are based off this platform its strictly luxury.
THAT is the point, you need platforms engineered specifically for the luxury application not a simple re purposing. Re purposing leaves compromises and allows complacency to set in. But hey if thats the kind of car you want by all means buy a Buick.