That means that there are certain things which aren't answerable, at least not easily or precisely. But that isn't a problem with the epistemology you adopt: so

That means that there are certain things which aren't answerable, at least not easily or precisely. But that isn't a problem with the epistemology you adopt: some things are going to be hard or impossible to know no matter how you define knowing. Or, "how to live" isn't an epistemological question. So demanding that an epistemology accept aesthetic standards to accommodate concerns about how to live is confused.