I am terminally online and have seen exactly zero people say this about Feinstein. The RBG thing I’ve seen a lot (and agree she should have stepped down and let Obama replace her).
Living in California - I heard about Feinstein's issues constantly - especially in the final years. But both sides have always propped up an elderly figure and helped them press the right button on a vote. See Thurmond who was giving scripts to read and who was literally just wheeled in for votes
It was literally just a year ago. Many op-eds were written telling her to step down, many excuses were made why she shouldn’t. Concerns began in 2010 but Ds rallied behind her in 2018. This was all discussed a year ago.