Held too many strong opinions for really no good reason other than technical "virtue signaling" of sorts. At the time, it felt so right. I had all the perfect, rational arguments. Years passed, experience and nuance decayed the strength of my opinions, and it was fascinating to realize -- even where I was perfectly right, I was mostly only right accidentally, my arguments were just a story to fit the narrative, never…
But I suppose if you could go back and do it differently, you would, so I can appreciate why you consider this to be a mistake.