Every single meandering bullshit conversational path we happen to find ourselves upon can be immediately curtailed by stating these words. Technical folks may not like hearing it all the time, and it doesn't necessarily have to be the dominating factor 100% of the time (i.e. side-projects, 20% time code activities, etc). But, this is the penultimate tool for ending arguments and separating the bullshit from the reason people are receiving paychecks.
Very scary time-crunch episodes can in many cases be diffused by simply going to the customer and asking them, "Out of these 10 things, if you could have 3 by the end of the month, which would you pick?" I think you would instantly get a picture of how you should prioritize your efforts to drive value for them. I strongly suspect that if you can meet incremental targets in descending order of value (as perceived by the customer), you can keep virtually anyone happy. Hitting customer targets successfully is also very good for morale and can further compound productivity on all ends.