One of the most powerful and underused tools in any manager’s toolkit is “I have no opinion”. In fact, it’s useful for anyone who is asked to provide input on a thing.
Unless you’re contributing real value to a question — don’t answer it. Unless you can really answer “why do you hold this opinion” — unless you can really justify your position on something — don’t respond.
“I have no opinion” is polite. It means “I’m not going to clutter your head up with a non-valuable bunch of words.” It says “I have confidence in your ability to make the right decision.” It’s rewarding to the other person. It’s empowering.
See “Why Should I Care What Color the Bikeshed Is?” for a great in-depth discussion on this.