yeah and for some reason primary literature can't be used, except when it can, but review articles are allowed. makes no sense.

Literature reviews summarise the state of knowledge in a given field, and given Wikipedia articles are about the knowledge on a subject rather than the contents of a specific paper, I don't see why it would be unusual to rely on them. Is there anything specific that you find doesn't make sense to you? It's fairly common in, e.g. medical research for individual studies to be not relied upon and meta-analyses are certainly generally considered stronger evidence on any topic.