Once upon a time, luxury brands built unique cars and added special editions for extra profit. Now luxury brands tend to build more cars based on volume brand platforms, the special edition seems to be giving way to a new phenomenon: unique luxury trim levels. GM has been a proponent of this system for some time, adding Denali trim levels to its GMC upgrades of Chevrolet trucks. Now, The General’s Cadillac brand has announced it will be adding Platinum trim level options to every vehicle that isn’t available in “V” form. The impetus for this is clearly the dream of coaxing BMW “M” or Cadillac “V”-style markups from consumers who don’t care about dynamics or power, but it also fundamentally undercuts Cadillac’s status as a true luxury brand… as well as Buick’s raison d’etre as an entry-lux brand. Or does it?