Sometimes, it's used to obfuscate. If you tell your sales guy that "we're experiencing a variety of polymorphs in our recrystallization experiments", it sounds a lot better than "our purification isn't working." While I think a smart customer and an intelligent salesperson will know what you're doing, the first statement provides a level of specificity that suggests "hey, these people know what's going wrong and therefore, they're more likely to fix the problem." All of this, of course, assumes that you actually have multiple polymorphs in your recrystallization -- if you actually don't and you say that, well, you're lying.
I think the right way to use jargon as a tool for exactness; it can shorten conversations ("NMR" and "TLC" are really helpful abbreviations) and can help you say exactly what you want to say, when you want to say it. Like any tool, there's a time and a place for each use, even when it's connected by a non-reversible tremmy pipe.