I can't speak for anyone else, but if I don't accomplish anything of substance at the end of the day, and this trend keeps on for multiple days in a row, I start getting really depressed.

I'm not saying that it's 100% open-office's fault if I don't accomplish much, but I do think it can be a strong contributing factor.

Same here. I get my happy vibes at work when I make a thing.

> I do think it can be a strong contributing factor.

Even if it's a small factor, an open office doesn't actually help with collaboration, so it's all downside and no upside.