I've played some RTS strategy games where you could test your own defenses: select an attacking force and have them hit your base to see how your setup works.

Wouldn't it be nice to go out in disguise and "hire" some raiders to come and get chewed up to test out your builds? Set up a Deathclaw/Nasty Wasteland Creature "bait" trap and lure them in?

...sigh.... Fallout 5, maybe.