Hmm, so should I buy a genuine Audi oil filter for my car or use a reasonably priced Euro Car Parts MANN filter. Nope, I'll stick with genuine Audi to appease my warranty obligation. Oh look, it's the same filter with an extra Audi stamp on.
It's not in the interest of car manufacturers to make their own parts, apart from body shells and seats, so most parts are outsourced anyway. I appreciate that they are probably referring to cheaper non OE parts but surely that's customer choice.
I've never felt any need to buy parts like oil, filters, spark plugs, gaskets, belts, bearings, tyres, bulbs etc from main dealers as they're all bought in from the same manufacturers as the aftermarket. This sort of law is lobbied for by the car manufacturers to replace their falling profits, both from selling cars and servicing. It's also why their solution to any situation concerning vehicle is buy our new
UltraAardvarkGsErxy Green Edition Plus model which is specifically engineered not to do that.
Just out of passing interest, your Omega's seats were made by Recaro....