The Matsuta preprint uses an idealized reentrant channel to demonstrate that drag strength relative to wind forcing creates a sharp regime transition in Antarctic Circumpolar Current (ACC) eddy saturation. Below the identified threshold, saturation emerges from combined standing meander steering and eddy diffusivity changes; above it, only meander adjustment sustains the weak transport sensitivity. This modeling choice, while computationally efficient, omits realistic bathymetry variations and seasonal mixed-layer feedbacks that observations from the SOCCOM array show modulate eddy activity. Earlier work by Marshall et al. (2017) emphasized standing meanders as dominant, yet overlooked how bottom friction modulates their contribution, precisely the gap Matsuta closes. Meanwhile, Abernathey and Cessi (2019) highlighted eddy diffusivity adjustments in coarser models, a mechanism the new results show collapses once drag exceeds the threshold. The preprint's findings imply that divergent conclusions across the literature largely stem from inconsistent drag parameterizations rather than fundamental dynamical contradictions. Under future wind intensification projected by CMIP6, many models may inadvertently cross this regime boundary, altering predictions of Southern Ocean carbon uptake by up to 15% according to sensitivity tests in related eddy-permitting simulations. Limitations remain: the study provides no direct comparison to mooring or satellite altimetry data, and its steady forcing neglects storm-track variability that real ACC transport records reveal as critical.