In my opinion your collaborator is absolutely right. Punctuation is very important, it is like breathing. Of course the sentence is correct also without, but putting a comma helps the reader to breathe and wait for the second part of it. In a technical reading this is maybe less important, because you are concentrated on other things, but in a novel or in a newspaper the wrong use, or the non use of the punctuation is very bad. Let me also say that a "stupid" comma is so important that can change the whole meaning of the sentence, as the famous phrase attributed to the oracles of Dodona:
that you may find also in the form
"Ibis et redibis non morieris" in bello.
Depending on the position of the comma, the response changes completely.