Eh, it's all horses for courses. Sometimes you have to hit a date, sometimes you don't. Sometimes having something is better than nothing, other times unless

Eh, it's all horses for courses. Sometimes you have to hit a date, sometimes you don't. Sometimes having something is better than nothing, other times unless you have all the functionality it's worthless. Sometimes you can know all the requirements upfront, other times they are ambiguous and require testing and failing. The only way to be wrong is to pick one methodology and apply it to all circumstances. There are times pure agile will work, there are times waterfall will work, and there are times that neither of these are right and you have to do something else.