Not just with outsourced developers. Computer science graduates hired in house to assist in writing specialised engineering software can often be a dead weight in the team for quite some time. This is not just because they and the engineers don't speak the same language but also because the CS graduates know nothing about physics and engineering so they cannot properly evaluate requirements documents.

Left to their own devices they often implemented requirements that were full of errors or even completely unnecessary because they did not understand the domain well enough to ask pointed questions.