Keep in mind that while there were calls to nerf it, there wasn't an epidemic of people getting it in roulette and dropping group. People doing MSQ have always been able to complete it, although it may take a few tries.
Steps of Faith was nerfed because a large segment of the community said "F that" and simply refused to do it ever again, thus forming a wall that newbies couldn't get past. Groups also tended to devolve into yelling and bickering over who should be doing what. To the community's credit, Menagerie wasn't nearly as bad. There were more people willing to help people through it when it came up. I don't know if wanting it to not get nerfed into the ground was a factor or if people were just nicer this time around, but it never formed the same kind of MSQ brick wall. Thus, SE didn't need to act.
It's too bad in that Steps of Faith is a neat encounter, but it's one that benefits massively from a group having a leader explaining who should be doing what, and having people willing to do it. When you either don't have anyone taking charge or have people arguing and refusing to do a given role, it simply doesn't work.
I agree. Hell, I had my WHM 70 quest done before Doma Castle, because I'm slow at completing the story, lol (not that Plenary Indulgence even remotely mattered at the time). That 290 gear is itself something that matters and it's something the game should try to make sure people do.