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For over a half a century now, researchers in various kinds of situations, mostly psychologists, communication professionals, sometimes marketing professors in business schools, have been studying how you can say something in one particular way that will significantly increase the likelihood of assent to that thing, and have been checking their theories and their hypotheses in scientific experiments that allow us lessons that we can provide to the larger community beyond the scientific establishment of how you can be more effective and how you can be confident that you will be more effective because it's grounded in true science, not just hunches and speculations of people who want to talk to you about this process.
They give their assent to plans they hate and they confuse everyone around them by failing to express, in due time, with the requisite courage, their authentic needs and ambitions.