If your aim is not to be identified, I can understand keeping your mouth shut about matters of opinion, especially if you hold distinctive opinions you have given out in public before. One of Ulbricht's reported failings [1] was talking about Mises and the Austrian School as both Ulbricht and DPR.
Keeping your anonymous persona's mouth shut about history, politics, economics, sociology, art theory and human nature is good 'opsec'.