I think clarifying that diminishing chance / not supposed to get them all with some slightly less vague text would be helpful. It's less that the game presents them in a way that makes them feel like you're supposed to complete it and more that all the other systems in the game up to that point do work on a completionist model (put simply), so why should this one be any different?
Viewing post in Cycle of the First Dawn comments
Yeah, that's exactly the distinction. It's less a problem with how it's presented and more that the rest of the game has trained you to expect permanent progression systems to eventually be completable. Having the wilderness suddenly be the exception makes it feel inconsistent even if I explain the diminishing chance better.
That's a big part of why I'm looking at changing the system itself rather than just clarifying the text. I'm in the middle of a fairly large content update and some bug fixing right now, so the revamped wilderness system will most likely come with that update as well.