Oh no, I totally covered this topic in my entry about Examine!
But I will add to this that you can have a mystery in a non-investigative scenario, and that it will add to the experience. Even if you’re a group of scoundrels fighting for territory to sell your drugs, it is fun to not know how the rival gang gets their drugs, how they transport it to the sale location and why it’s so similar to your own stuff. It’s not an investigative scenario (the goal is not to find out ‘whodunnit’), but having this (admittedly thin) layer of mystery adds to the situation and, crucially, gives the players multiple avenues to take as their next step, which allows the GM to show them more of the setting and what’s going on. And that is awesome!