The tip of the red giant branch was supposed to be the distance ladder's neutral arbiter, and instead it became the tension's most contested rung. The TRGB method exploits a fixed stellar physics landmark: the helium flash caps the luminosity of red giants at a nearly universal absolute magnitude, visible as a sharp edge in a galaxy's color-magnitude diagram, calibratable geometrically and applicable in galaxy halos far from the dust and crowding that complicate Cepheid fields. Its promise of independence delivered controversy instead: the Chicago-Carnegie program's TRGB calibration yielded H0 near 69.8, splitting the difference between Planck and SH0ES and softening the tension, while independent TRGB recalibrations (Anand, Soltis, and successors) of the same data landed at 71.5-to-73, and the disputes burrowed into the method's fine print: the tip-detection algorithm's edge response, the LMC and NGC 4258 anchor treatments, field-to-field extinction, and the color dependence of the tip magnitude.
The JWST era sharpened rather than settled the split: CCHP's JWST-only TRGB gives 68.8 with JAGB at 67.8, while the SH0ES-side analysis of overlapping hosts argues the differences trace to supernova-subsample selection rather than the rungs, since the underlying distances agree at the one-percent level. That agreement is the buried headline: multiple independent stellar physics methods now concur on distances to the same galaxies while their H0 values fan across the full tension range depending on which supernova hosts each program admits, a pattern that indicts the assembly rather than the astrophysics.
The standing is a method vindicated and a number still disputed: TRGB distances are among the best in the business, the calibration arguments continue at the percent level, and the persistent fan-out of H0 across host selections remains the unexplained structure beneath the arbitration.