...when they basically kept remaking the same 4 games repeatedly...
From that perspective, this could easily be said about a majority of the output from the japanese arcade industry back then. Releasing fighting games/beat em ups, 2d shooting games, and the occasional racing or sports title seemed to be par for the course for most arcade focused devs in japan during the game center boom era.
As the majority of arcade game publishers doubled down on the genres that consistently generated money (the fighting game boom that japan experienced after SF2). Sadly, this strategy only helped ensure that the source of the majority of the innovations made in videogame genres would shift to home consoles which helped convince game center patrons that they could have even better interactive experiences at home instead.
Unfortunately, SNK bet heavily on indoor amusement centers and failed to captivate wider audiences when it came to home console games. In SNK’s case it wasn’t for lack of trying. Their published titles on the ps1 and dreamcast ranged from 3d rpgs like Koudelka to games in the then newly popular rhythm genre like Cool Cool Toon. Their pre-Aruze financial issues aside, it was all just too little too late.