Put simply: It matters because taste is not the only criteria used to select which seafood to buy.
One might make a choice based on mercury content, environmental friendliness, dietary restrictions (medical or philosophical), to support (or abstain from supporting) a particular industry, or something else entirely.
To allow fraud which can't be detected on the palate is to deny buyers their freedom to choose based on any criteria other than taste.
It is not up to the producer what criteria buyers use when choosing their purchases.
Also, if the consumer shouldn't care, the producer shouldn't either. If the producer thinks it shouldn't matter what it says on the label, well then... no harm in putting the right thing on the label, right? No? I guess it matters then.
One might make a choice based on mercury content, environmental friendliness, dietary restrictions (medical or philosophical), to support (or abstain from supporting) a particular industry, or something else entirely.
To allow fraud which can't be detected on the palate is to deny buyers their freedom to choose based on any criteria other than taste.
It is not up to the producer what criteria buyers use when choosing their purchases.
Also, if the consumer shouldn't care, the producer shouldn't either. If the producer thinks it shouldn't matter what it says on the label, well then... no harm in putting the right thing on the label, right? No? I guess it matters then.