  A recent paper by R. Muolo, T. Carletti, J. P. Gleeson, and M. Asllani
[Entropy 23, 36 (2021)] presents a mainly numerical study on the role of
non-normality in the synchronization of coupled periodic oscillators, deriving
apparent contradictions with the existing literature. Here, we show that their
conclusions are artifactual due to a misinterpretation of the master stability
function formalism and confirm that the existing literature is correct. We also
point to a broader existing literature in which research considered in this
paper was correctly addressed numerically, analytically, and experimentally.
