FLRW Uniformity Under Question

New preprints combining supernova and galaxy survey data report 2–4σ departures from the Friedmann–Lemaître–Robertson–Walker (FLRW) assumption that curvature is the same everywhere, and claim direct measurability of Dyer‑Roeder and backreaction effects. If confirmed with larger datasets, these deviations would force a rethinking of many solutions to current cosmological tensions that assume FLRW geometry. — Challenging FLRW would reshape mainstream cosmology (dark energy, modified gravity, interpretation of tensions), influence funding and public narratives about the progress and certainty of fundamental physics, and alter science‑policy prioritization for future surveys.