Clues are very neat, and for the amount of cool vignette detail that goes into them, I fear for the burn-out proof of the staff. It's a lot of what I imagine to be off-the-cuff writing about various subjects, and that's a pretty admirable trait to have in a writer, and a world-builder to boot. Given the nature of Arx's aforementioned bent towards discovery of lost information and history, this is a great thing to have.
That said, the concerns about clue hoarding (usually because the information is dangerous, I would hope) is probably on point for some people, though I've yet to run into anyone who wasn't eager to show off their clue-fu if they had one on a subject. The way it works can /sometimes/ be a little weird for me, given that it's often difficult to formulate a full picture out of the information you have, and usually just makes me want to get more clues on a subject in order to get that full picture. My character's whole 'plot' is to find a place, and I usually feel as if I only need more clues after getting one. Granted, between investigations I'll usually make an effort to ask around about the information I've found to see if I can get the information I want through roleplay, but that's not usually the case, sadly, at least not on my character's passion projects.
So it can lead to a bit of a desire to get as many as I can, at least about subjects there's passion about, or subjects I've been inclined to research into. I just try to follow the RP, which should probably be the MO for everyone instead of just trying to know everything and be a walking Arx encyclopedia. This can make actually being a scholar difficult at times, since they're expected to know lore stuff, but most of the time I really don't, and it sorta makes me sad to come off as ignorant in my character's profession.
But, anyway. Theories are Cool and Good as a way to convey to others a going understanding of knowledge instead of dumping clues on their heads and letting them make of it what they will. If it's a subject I know a lot about, usually I'll just prefer to RP out my explanations, or write a book, cause that shit is my jam, but I do love me some theories when I get them.