You know, now that you mention it it would be very cool to see bandits acting as a survivor would. I think it would add a lot of life to the somewhat dull streets of Unturned 3.0 where all you find is some zombies, a few special variations of zombies, and rarely boss zombies. Occasionally seeing some bandits say looting a store or driving around in a car would present some different ways to get items, such as say, stealing from their vehicle while they are looting a store, choosing to avoid them and stay safe from conflict, stealthy eliminating them, sabotaging the exit, etc.
Another idea could be bandit camps or maybe even bandit bases. If you have played Read Dead Redemption II, Online or Story modes, you have likely run across a random encounter with some bandits at a campsite. A small location, with maybe a tent or two, a campfire, and a few bandits. Something like this would again present options to the player like before, and help solve that feeling of being the only human left in the apocalypse.
(Also, having more advanced stealth mechanics would be a dream come true)