I think your question would make sense if these were the only two reasons. Someone who just wants to make sure their old games can run would see these tools as a good thing. People who just enjoy reverse engineering by hand wouldn't care this exists, or maybe even, a helpful tutor.
So perhaps then, the sentiment being as negative as it is, is revealing something about the hobby: that many participants, considered the metagame of being the first to do it, to be "smart enough" to have figured it out, the "street cred" if you were, is what they are lamenting, but they just either lack the words, or aren't being honest with themselves.