"The main difference I see between the first and second definition is that the second definition doesn't really fall into a matter of "Right or wrong." It's more "Personal preference," which can't be wrong. I can say "I prefer FFVII to OoT," and it's neither right nor wrong for me to have that preference."
If you are asserting that the second definition is immune to right and wrong, but that the first is not, and that the first is still a valid definition of opinion, then by definition, some opinions are still capable of being wrong.
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There is no shame in not knowing; the shame lies in not finding out