If that preset is best served by a "Rock" label, then why not?

Because that's missing the point of EQ.

There should be no need to EQ all rock albums differently than classical albums or jazz albums. However, I could understand (as I said in the linked posts) why one would want to EQ an individual song or an individual album differently.

For my collection (which does contain rock, classical, and jazz), I would have more desire to EQ individual rock albums differently than I would want to EQ entire genres differently.