Observations suggest that internally driven, “secular” evolution in disk galaxies—processes like bar-driven gas inflow, pseudo-bulge growth, and gradual reshaping of disks—appears to slow or saturate at late times, with many galaxies showing only modest ongoing structural change compared to the expectations from some ΛCDM-based simulations that predict prolonged bar growth, strong angular-momentum transfer to dark halos, and continued bulge building (Kormendy & Kennicutt 2004; Sellwood 2014). Reconciling the prevalence of fast bars, relatively small pseudo-bulges, and seemingly stalled secular evolution with the strong dynamical friction and long-term bar–halo coupling expected in standard dark-matter–dominated halos remains challenging, often requiring galaxies to be more baryon-dominated than simple abundance-matching and ΛCDM prescriptions would naturally suggest (Debattista & Sellwood 2000; Sellwood 2014).