That actually touches on something I may need to make clearer: you aren't intended to find every imprint.
They're meant to be small permanent bonuses you may discover while spending time in the wilderness, not a checklist you're expected to exhaust before moving on. The diminishing discovery chance is partly there for that reason. Eventually the sensible choice is supposed to be to leave some things undiscovered and continue progressing rather than repeatedly restarting lives trying to clear a region.
I am aware that, because of where the current end of the available content is, wilderness grinding may effectively be one of the few things left for players who have reached that point until the next content update. That can naturally make the imprints feel like the remaining progression objective. They weren't designed around the expectation that someone would collect all of them, though.
If the game is presenting them in a way that makes them feel like something you're supposed to complete, that's useful feedback and something I should look at making clearer.