You have guys working for weeks/months on a project, getting expert knowledge, analysing new requirement continuously. The number of times I have had, over the

You have guys working for weeks/months on a project, getting expert knowledge, analysing new requirement continuously. The number of times I have had, over the course of months, to explain again and again why you can't "just" remove feature X from project Y to make it doable in less than D days it is currently estimated to. One day, I would commit to do it because at that moment I didn't remember that specific bit while being quizzed in an unrelated meeting that veered into offtopic armchair solution designing by bored "solution architects" (i.e. middle manager who last looked at code a decade ago)