I'not sure open offices are so unpopular in practice.
I suspect a handful of people with misophonia are passionately against them. A sizable minority think they makes work more fun, and the remainder are indifferent.
As someone who loathes them myself, I read all kinds of articles about how awful they are. But that's how news works: I'm a likely click for any article that vindicates my hatred of my stupid boss. So while I've seen plenty of surveys showing people complaining about it, I'm doubtful I'm seeing the same data management is.
I've simply never seen anyone really protest it. It's a small sample, but if I've worked with a hundred people, that predicts the real value is small. I even had a team that actively wanted management to remove the dividers when we had half-cubes, and I was the lone holdout!