The series deserves mention as one of the best JRPGs ever.
There's the answer as to why they don't. Not all of us who own and played them consider lowering ourselves to discussing them because of the regional value placed on them by the not so silent regional minority.
You want to talk RPGs i'll be more than happy to discuss them. You pull the regional card when mentioning them and you basically become the equivalent of an ignorant individual with an abnormal regional mentality. In other words, you are a reminder of how not to be a gamer.
As for the topic, there are tons of games that get little to no mention no matter the system they are developed for. It's pretty sad really. Funny thing is those that do get discussed on this site is mostly hate speech or abnormal regional mentality.
She blinded me with region .... Yuki Nagato, Mafuyu Oribe, Kurumu Korono, and Himari Noihara FTW