Honestly I think another really good example of this is the first boss in Strayborough Deadwalk. I know people tend to dislike this boss so this may be unpopular opinion bait, but I have always personally loved it. It's genuinely one of my favourite dungeon bosses. I think it's a really smart way of keeping players engaged in the fight using the randomized nature of the players themselves.
The Spirited Charge mechanic has the groups of dolls target different players based on positioning. They will then run in the direction of whichever player each group targeted. Sure a group of 4 completely organized players can bait the dolls to run in a very specific pattern and make it the same every time, but this just isn't going to happen. Normal duty finder just won't have that kind of organization. So what ends up happening is a mechanic that looks random on the surface, but is really that way because of the random nature of player positioning. The fight itself doesn't actually have any RNG, but due to the unorganized nature of duty finder it does.
I think it's a really smart way to cause players to have to pay attention to whats going on no matter how many times they've done the fight. It also has one of the rare examples of consequence that isn't just vuln stack. I would love to see more of this.
