I mean, your logic is sound, but that's not how car warranties work in EU or the US for that matter. Car manufacturers can only void warranty on parts directly affected by your modification, and they actually have to prove that the part broke because of the modification, it just being present is not enough to void the warranty.

I know of a case where the engine on a new Audi RS6 died, and Audi refused the warranty claim because a custom exhaust has been fitted, claiming that it affected the operation of the engine and destroyed it. The case went to court and Audi was unable to prove how a custom exhaust could cause the crankshaft to snap in the middle - and the court ordered them to pay for repair.

There's loads of nonsense around this, with dealership frequently telling customers that if they fit their own parts they lose the entire warranty - nope, that's just not the case at all. Using your own oil, filters, brake pads and other consumable items does not void your warranty as long as they are "equivalent" items. I even heard a dealership tell a customer once that fitting tyres without manufacturer approval(MO in this case) would void the warranty - I told them that if that's the case, why is their own parts department selling entire sets of them as "original Mercedes accessories" then. The truth is it's bullshit, that's just not how warranties work.