I didn't feel comfortable being candid with my employer until I was financially independent.
As 'kimscott is trying to point out in thread -- there are ways of being candid that aren't simply "you're wrong and I'm right, so shut up and listen" -- which is not how you should behave, either with your boss or with your subordinates. All things being equal, candor (with empathy toward the recipient and openness to being wrong) leads to better results than keeping your opinions to yourself and stewing silently.
Yes. And in some cases, I left jobs out of fear of losing mine for being candid. Better to leave on your terms than someone else's. I'd share my concerns in my exit interview, and move on.
> All things being equal, candor (with empathy toward the recipient and openness to being wrong) leads to better results than keeping your opinions to yourself and stewing silently.
I agree. I don't think this will happen in at-will employment environments though. Are you going to be candid, even when told your job is safe, if you can be fired at anytime with no recourse? NOPE.