Unquestionably, inventors of useful devices deserve credit for their ingenuity, but the engineers who help develop an...

Emil-Kunkin on March 18 at 10:10PM

The author is arguing that inventors get credit while engineers do not, and that this is wrong. This is the problem identified in the argument. The fact that sometimes they are the same person is an acknowledgment that the problem does not occur in every case, because when they are the same person the engineer does get credit, since she is also the inventor.