Earlier quoted context omitted.
In many cases it can be though. If I'm asked for an estimate to do X and I say I can deliver in three weeks, and my boss says customer needs it for golive in three days, I'll try to find some way of making that work. Perhaps they can live without a full solution for the first few weeks, instead requiring only a subset of the requirements in that period. Or, if I insist it just cannot be done, I'll tell the boss who'l…
That's a discussion. Not haggling. Demanding the same for less is haggling. As if we can magic time reductions out of our asses without cutting features .
Of course on any project I might be able to deliver the same in less time, but then at the expense of something else. That might be acceptable if the boss thinks he can manage the other clients which work gets delayed.