Well… They are different genres. JRPGs in general are more popular than CRPGs as a genre (if you define CRPGs as the isometric computer RPGs like Baldur’s Gate or the original Fallout). I think including CRPG-adjacent games on here makes sense, like ARPGs, all of the Bethesda games, Immersive Sims, and all of the BioWare games, but JRPGs just does not make sense to me. If we include all the CRPG-adjacent games, this community could be more successful as they are very popular.
JRPGs and CRPGs branched off in the 80s, and since then the style and approaches of the two genres are very different. CRPGs are a tabletop rpg simulator, where choices and player agency are most important (substance over style). JRPGs are a story-driven spectacle where the main gameplay is strategic party-based combat (style over substance).