Benchmarking <scp>mesa</scp> isochrones against the Hyades single star sequence

Based on GAIA EDR3, we revisit and update our sample of bonafide single stars in the Hyades open cluster. The small observational uncertainties parallax photometry EDR3 result a tightly defined stellar sequence, which is ideal for testing calibration theoretical evolutionary tracks isochrones. We benchmark solar-scaled MESA models against star sequence. find that non-rotating [Fe/H] = +0.25 provide good fit with masses above 0.85, very low mass below 0.25 M$_\odot$. For between 0.85 M$_\odot$ systematically under predict observed luminosity. One potential limitation partially convective more massive than 0.35 prescription (superadiabatic) convection mixing-length theory parameter $\alpha_{\rm ML}$ tuned to match Solar model. Below M$_\odot$, increased scatter sequence might be manifestation kissing instability, driven by variations $^3$He nuclear energy production rate due instabilities at core envelope boundary. Hyades-like population, application subsolar could significant underestimate age, or an overestimate metallicity. suggest future grids complemented Hyades-scaled range