Considering how many people really don’t like E8S’s semi-random Light Rampant mechanic, I doubt an encounter that relies purely on random mechanics would be very fun — especially for melee DPS. In the case of Hades Ex, during the first phase’s falling circles mechanic, a lot of groups just mitigate through it because it’s easier than trying to dodge them.

Regardless, I think the more random mechanics really only belong in Extremes and up. The higher the degree of randomness of the mechanic, the harder it is to execute. I can’t imagine having to coordinate a random PF/RF party to do Limit Cut+Hawk Blasters in an Extreme fight, and we’ve already seen what Soar did to the Party Finder lol.