Sounds like the bugs in this game would've been another issue.
And maybe some of the same reason the official localization of Final Fantasy II (NES) was canceled. They decided that game's system (having stats effectively auto-changed, raised AND LOWERED, based on your characters' actions) was too much for Americans to handle.
Maybe we got the GB SaGa games due to not much competing games available. (kinda of like why we would've gotten Mother 3 in English if it came out on the N64, but when it was moved to the GBA, Nintendo didn't want to localize the game anymore.)