And still people with eagle eyes or the right monitor setup would have tremendeous advantages to see them or not. While basically cover does the same thing (and bandits taking cover is something TFP is implementing right now according to Faatal)And one of this perks could be that you detect bandits better. You start with nearly invisible bandits on the map. And while you improve your ability to detect them (for example with special eyeglasses that you can craft), your ability to see them increases. This would be fit in an RPG.
What would be the reason for invisibility, by the way? Are you assuming some future tech the bandits use, which would be contrary to the backstory. Or is it just a crutch to signify a bandit is in stealth?
In case it is the latter: I don't see the neccessity yet for bandits to have stealth, especially if it needs a crutch like this. Maybe if bandits are still pushovers even after all balancing and taking cover, then TFP should think about such an obviously gamey alternative.