Though people have complained about stuff that isn't perfect now even when the imperfect stuff was less imperfect than things had previously been pretty much as far back as we have records, so complaining about that isn't necessarily an instance of the thing being complained about.

Said less obscurely: if we assign the label kvetching to complaining about things even in the face of continual improvement, complaining about kvetching is not necessarily kvetching, since kvetching has continued unabated for generations.