I see what you’re saying, and I like the gist of your point for multiple comments in this thread, but for some reason this phrasing rubs me completely the wrong way. It will tend to be inflammatory and escalatory in a bad way in a debate or discussion to think of people who are well intentioned and trying not to hurt feelings as liars. I’m not sure that’s fair or accurate either. Like why, exactly, does a compliment next to a criticism irritate you? What if the compliment is true and the criticism is true, then where’s the dishonesty? Maybe what you mean is that the indirectness wastes your time or lacks clarity?
Does tact necessarily mean spending time giving compliments next to criticism? You can be tactful in the very wording of a direct criticism without being indirect or giving useless compliments, right? And it’s very very possible to be direct and tactless. Isn’t tactlessness sometimes a function of ignorance, not necessarily lack of compassion?
Some people make a distinction between critique and criticism, and this distinction may come down to tact? The critique is viewed as constructive criticism, how to improve, while criticizing is stating destructive negatives, “you’re doing it wrong and you suck.” The more tactful one of those actually happens to be the more useful one too…
But phrasing criticism unemotionally and directing it toward the decision or product instead of a person, isn't what I'd call tact, it is just standard politeness. It isn't manipulative so much as precise. The decision is what you want to change.
On the other hand, saying nice things to spare feelings without any actual intent to encourage specific behavior is dishonest and manipulative even if well intentioned. In extreme cases it can even turn into gaslighting where you gloss over problems and they think they are doing fine when they aren't. That sort of tact is toxic.
WRT to using passion and emotion to win an argument, I'm not so sure. I tend towards the passionate side, and while it served me well in startups and smaller groups where I had a strong reputation for competence and putting in the work. But as I moved into more senior rolls at bigger tech companies, where I need to collaborate with a broader set of people who I don't know closely, I had to tone it down to be effective. What style is most effective? Essentially it boils down to one thing: know your audience.
> tact is simply a form of dishonesty
Maybe it is, but our primate brains tend to get very attached to our ideas and opinions. People aren't rational. Tactfulness is one way to get the other side to see your argument without making them feel threatened. Is it manipulative? Sure. But in many cases it's the only path that will get results.