But see, Dark Souls is very much an RPG but uses more western RPG design axioms than those of a JRPG, which is why this genre is not at all about being made in Japan. Disgaea, Final Fantasy Tactics, and Fire Emblem often get linked together as a strategy RPG or a tactics RPG. Kingdom Hearts is a real-time or action JRPG, Persona is a turn-based JRPG, and the "active time battles" of the late SNES and PlayStation era from Square sort of straddle a few of those lines, but there are commonalities among all of them that a fan of Earthbound could reasonably be into. Likewise, there are commonalities between western RPGs and JRPGs where someone who's just into "RPGs" would be into. These are just genres and subgenres.
The other thing too is that the definitions of these genres will change over time as more games come out that can be grouped together. When games inspired by DotA started getting released commercially, some tried to call them "Action RTS" games, but then you'd have games like Smite and Super Monday Night Combat that no longer have anything to do with the RTS genre, so Riot's coined "MOBA" stuck because, even though it's kind of a lousy name for that genre, it doesn't contradict itself by calling them a derivative of RTS games.