Being able to say "no" is absolutely critical.
Of course, you do incur a risk and you may fail or hurt your career in that org up to the point of termination even if you're "right". Moreover your follow-up after saying "no" will be judged harshly and silently for every little snag, real or not.
But that's part of the deal, right? It's not easy, if it were easy you'd have dream-teams all over the place rather than an industry where occupational dysfunction is normal.
> Just insist...
Some companies work like this, but many don't. Such utterances could be charting a course to the door for you.
Learned helplessness, indeed.
Yes, there is 1% who can't follow that advice for various reasons of desperation. Not enough to continue arguing this thread.
No, don't bring the company to a halt with a tantrum. Just insist on getting one thing fixed a month and nine months from now everyone will be a lot happier.