I think the difference between your comment and mine is I assumed the parent commenter is complaining about 50mm FOV being too tight on a APS-C sensor, and you've assumed they're complaining that 50mm is too tight on a full frame sensor. Either could be right.

But I think we've all gotten a little lost in the weeds, as the original article was recommending it not specifically because of focal length, but also because of lens speed compared to the 18-80mm zoom lenses now common on DSLRs.