Just when you think a machine is good for isolating, think of the consequences that may come from it. Besides, I think the title of this thread is "Upper chest activation'...no?
Um, I don't think anyone believes because a machine is good for isolating one body part, that doesn't mean you can't injure another body part. I have absolutely no degrees or certification in training, and I even know that. In fact, who wouldn't know that? You must be talking to some really dumb people.
I mean, a hammer strength may isolate the chest more, but that doesn't mean your shoulders and triceps are still not getting worked. I cant imagine anyone asserting that just because a machine is meant to isolate one body part, it doesnt mean other body parts are also not getting worked.
Consequences can come from any movement. Look at all the powerlifters who get injured every year using free weights.