Error in the countertop, allegedly natural…

That would bother me too. One can of course argue with "natural product," but I would find it more convincing if the rest of the slab also showed similar veins or inclusions. However, here the rest of the slab, as can be seen in the photo, is very homogeneous in the grain. This one large, light spot immediately catches everyone's eye. I would also try to make a claim about that.

For me, this has nothing to do with "complaining about nature." The natural speckles are fairly uniform across the entire slab. This creates a harmonious appearance and looks calm and consistent. This point, whether natural or poorly repaired (which would be even more reason for a complaint), stands out extremely, and if it were normal and regularly occurred in the stone or was its characteristic, it would have had to be shown or mentioned in the sample beforehand.

Then "Fehlstelle" was the wrong choice of words. I don't understand why it was repaired so brightly.

That was definitely not repaired but is a natural inclusion in the stone. It is a natural material after all. If you can't accept something like that, you have to choose the specific slab beforehand or must not use natural material.

I'm also wondering if it would trigger me or not (I'm a picky person myself). I think the bright coin makes it worse than it really is. After all, it is a WORKtop .... and a natural product.

Is there really nothing placed on the countertop where you might accidentally put the TM or Döner rotisserie exactly there?

With wood, there are quite clear definitions of the qualities and how large defects may be. I can well imagine that there is something similar with stones. Especially when choosing a natural product that shows a uniform appearance, I would expect this to belong to the selected quality.

Put the fruit bowl on it and that's it... Replacing the countertop because of an inclusion is out of all proportion. Just think about the waste and effort. – Everyone talks about conserving resources, but no one is willing to make sacrifices with themselves and their demands – kids, this is madness! Well, you could say that in a single-family house replacing the countertop doesn't make much difference anyway... but one should try to keep a sense of proportion.