Your, explanation of how, it might be, done is not arbitrary. The statement, "so that, it assists" the reader, is. Anyone, could, decide what may or may not assist a reader and thus place commas wherever they feel, would do so, even if that would actually, assist very few people at most. (I thought that the reader might need a bit of assistance with my entry, so I added some commas where I thought that they might be helpful.) ;-)
One of the issues is that this isn't chiefly a forum for NESs to learn how to improve their English skills. An NGS writing in English could very likely think that a comma before "if" or "that" would "assist" the reader because that is what they are accustomed to seeing in German.