Please inform me of another pass/fail mechanic fight with a moderately tight enrage timer (bonus points if you name one that also heals).
For the crowd you are talking about:
Ultraxion, pre-5.2 Al'Akir, Tsulong, Festergut/Putricide would most likely qualify.
If they're sufficiently worse, you could even work Saurfang into the mix, but that's pushing it (it would have taken a monumental amount of ugh to make Saurfang get to unhealable Marks range on Normal).
Tsulong would even fit your heal criteria since you can consider the damage he takes when you fail a pass/fail mechanic in Day phase as healing. While Putricide wouldn't have technically taken you into a Berserk, losing enough people to let Mutated Plague stack high would have definitely done the job.
In the loosest sense of the words, Ultraxion's mechanic is considered pass-fail. I'm not attempting to brush it off as it does fit the definition of being a patchwerk-style dps check with a pass-fail mechanic, but it simply is not comparable to Durumu maze.
The pass/fail of Durumu's maze comes down to "find the safe spot at the start". It's as complex as Ultraxion's pass/fail, with the added "EFFORT" that when you succeed, you run around for a minute or so. But once you've found the safe spot, you've passed the mechanic unless you do something equivalent to jumping off Ultraxion's platform.
Now, don't get me wrong, if you're saying that the maze graphic should be more intuitive, that's one thing. That's most likely something that should happen anyway.
But if you're saying it's overtuned because a raid can't kill the fight with 2 people down for the majority of the fight, that's just silly.