Rika didn't invent overly dramatic codependent lesbianism for people to be confused/surprised about SatoRika and question whether Rika's feelings for Satoko are as strong as Satoko's feelings for her
The details differ but we are ultimately seeing the same arc play out right now with Satoko that we already have with Shion (which is why the hate is so baffling). Like hm who else have we seen crack under the weight of trauma stemming from childhood abuse and do terrible things