"We'll try" can be the saddest words a programmer has ever spoken, and most of us have spoken them more than once. We've covered this material in other forms already, but it bears repeating here.
These words are often the preface to months of grueling effort against a deadline we know in our heart we cannot make. At the end, we come up tired, burnt out, beaten, and short. Management hates us, we hate ourselves, our families don't know us anymore or have fallen by the wayside. The software, if it works at all, is nothing to be proud of.
Oh, there have been exceptions. Successful products have been launched ...