Yes, they do need to all have their own category, but having their own page is not as important. For example, we have solution pages that refer to quotes, webinars, workforces, videos, ebooks, case studies, etc.
I could enter all of those fields manually for now, but it will be much more powerful if I could update all of my quotes, for example, in one fell swoop instead of going to all of the pages that reference it, or if I can swap out the picture of an employee who's also a speaker in a webinar, the author of an ebook, the quote in a case study, and gives a testimonial in a video by just going to one location.
I can do some of this right now, but I'm limited to choosing what things are most important to link across the board, and I'm not looking at collections as things that necessarily need their own page, but rather as collections of things that can be referenced and changed globally.
Hope that makes sense.