I understand what you’re saying, but the paper ends with a two-page section (4.4) on “Observational Prospects,” including possible biomarkers. It seems like if

I understand what you’re saying, but the paper ends with a two-page section (4.4) on “Observational Prospects,” including possible biomarkers. It seems like if nothing else, the point is to not rule out such worlds in the search for extraterrestrial life (including intelligent life).