>"Now I'm not saying X, or Y, and I'm definitely not a P, and I don't agree with everything Z said but..." How can you have a conversation if so much time is spent not saying things?

Further, it intellectually constricts the speaker, both in thought and speech. It's running a race with lead weights and straitjacket.

For a smaller, but longer-lasting example, think of how many times in the past six years you heard someone preface a statement with "I hate Trump, but". Those who lived under Communism and Nazism experienced the same thing: Anything that might be perceived by another as being against approved thought in any way had to uttered in a way that would plausibly insulate the speaker from undesirable consequences. Now, think of how long-term adherence to such behavior crabs the intellect and soul.