The thing is, one also needs to learn how to
effectively share opinions. 'Rewriting software systems is stupid,' while (arguably) true is almost certainly unlikely to be effective. 'Iteratively evolving and improving our software system in these ways can yield both a higher and a sooner ROI than stopping to rewrite the entire system' might work better.
One also needs to learn to read the room. Sometimes one simply can't persuade others: then the question is whether to go along with them, or to resign.