Left panel: fraction of disc galaxies as a function of their stellar mass in EAGLE (blue lines) and IllustrisTNG (orange lines), compared to that measured in the GAMA survey by Moffett et al. (2016, shaded green area). Solid lines only show central discs; dashed lines include satellites. Central panel: stellar TFR for our sub-sample of simulated (central) discs with M_⋆​ >  ​5 × 10¹⁰ M_⊙ in EAGLE (blue triangles) and IllustrisTNG (orange squares) compared with the population of nearby spirals from the SPARC dataset (circles with error bars). Galaxies from SPARC are shown as circles with error bars. Filled red circles show the sub-sample of massive discs studied in this work. Right panel: stellar mass-size relation for the same systems.