There’s nothing anymore wrong with discussing the original topic than discussing eating kitniyos on Pesach. Some Jews do it and some Jews don’t. For both kitniyos and polygamy. Indeed, it is probable that changing the custom to start eating kitniyos for an Ashkenazic Jew is more difficult than for an Ashkenazic Jew to start practicing polygamy like Teimani Jews do.
Either way, having a serious discussion either about the original topic or about kitniyos is certainly northing wrong with.