After reading the article, I think a major factor is indeed the accessibility of home consoles and a sort of classism. Home consoles have always been mainly sold and marketed to Japan, North America, and Western Europe, and they've always been sort of a middle or upper-middle class thing at that. Maybe that's changed in more recent years, but regions outside of those gravitated towards other platforms like arcades or PC which were just more affordable to more people.
I think Street Fighter and Mortal Kombat were more dominant in North America because you could play those games on Super NES and Genesis, whereas KOF was just on arcades and SNK's prohibitively expensive (ironically) NeoGeo console. Before KOFXII I only remember playing someone's copy of KOF95 on Game Boy.
Oddly enough though, other SNK fighting games did show up on SNES and Genesis back in the day, and I played them quite a bit: Fatal Fury, Art of Fighting, I remember Samurai Shodown and World Heroes 2 in particular being the shit. Plus I probably watched the Fatal Fury anime movie like 100 times. SamSho and Fatal Fury are probably a bit more well-known in America compared to SNK's other properties.
An odd flashpoint for me though was when I moved to Germany and ran into a Last Blade 2 cabinet at a barber shop. I'd never seen anything like it.