V/σ ratio in the central regions compared with the V/σ at large radii. Top: V/σ(1 R_e) versus V/σ(6 R_e) for the ePN.S galaxies (left), TNG100 (middle), and TNG50 (right). Bottom: V/σ(3 R_e) versus V/σ(8 R_e) for TNG100 (left) and TNG50 (right). Different colors in the ePN.S sample mark the SRs (in red), the FRs with kinematic signatures for triaxial halos (i.e. with kinematic twists or misaligments, in green), and FRs with PA_kin aligned with PA_phot (in blue). The gray points stand for ePN.S FRs for which the measured V_rot/σ(⟨6 R_e⟩) is a lower limit. For the simulated galaxies the different colors mark SRs, and FRs with different halo T(8 R_e): FRs that have near-oblate halos (in blue); FRs with triaxial halos (in green); near-prolate FRs (in orange). The gray symbols show simulated galaxies with too few particles at 8 R_e for measuring T. The size of the data points is proportional to the stellar mass. The gray dashed lines show the 1:1 relation. The TNG simulations reproduce the diversity of observed ETG halo kinematics and they echo the observed kinematic transitions between the central regions and outskirts of the FR galaxies, albeit at larger radii.