I think people are talking about the difference between a product being purely ground chilies, and something like this:
"Chilli Powder (Chilli Pepper, Cumin, Salt, Oregano, Garlic, Anti-caking Agent (Silicon Dioxide), Cayenne Pepper (20%)"
(from the label of Schwartz brand Hot Chili powder - which is what we buy)
So yeah, some of the stuff has other things in it - i.e., cumin, salt, oregano & garlic, in the example I've given. That stuff doesn't really bother me because I'd normally put it in chili and/or Mexican food anyway, more or less.
I would say most of us who cook with chili powder have found a way to cope here.
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I do think that some of these products have evolved a bit in the time I've been living here, because I have recollections of them having other (additional) stuff in them previously - when I first moved to England. I think sometimes they are more geared toward chili powder for Indian style cooking perhaps. Anyway, I regularly do Tex-Mex & chili with the products widely available here (we like it hot though!) & we are fine with the taste.
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I usually use a variety of chili products in the same dish: chopped fresh chilies, cayenne, chili powder, a blob of chipotle flakes, sometimes regular chili flakes...