Hi Lora,
Can you tell me a little more about what their plans are for separation? Their plans for categorisation could have a lot of benefits in terms of term-targeting, but I want to make sure I'm hitting on the right things, based on their plans.
In general, she need to conduct some keyword research into what people search for in terms of their content. If she finds that they are searching for a certain type of content (video, webinars, etc.), they need to segment those things so that they can develop a specific page tailored to the needs of the people searching for that content. Everything lumped together means that it's harder to optimise a page for every popular term. This is almost always best for SEO, rather than just dumping everything onto one page or onto paginated pages. You can essentially optimise "category" pages for each type of content you produce.
Is creating "category" type pages the sort of thing they're interested in doing, and are facing push-back on?
Cheers,
Jane