I work from home 75% now. When I'm in the office, I get next to nothing done.
[1] http://www.mnn.com/family/pets/photos/10-companies-that-let-... [2] http://www.quora.com/What-San-Francisco-startups-allow-emplo...
At one SF shared workspace area, this guy always brought his dog in. Damn thing would go sniffing around and most people thought it was cute. I found it very annoying, especially when I had food. While I could tell him to piss off and keep his dog away, then I'd come off as the dick.
I still don't think that sort of generalization is fair, though. I think a normal, sane office could be open, but without the ongoings that seem to be present in the environments you and the parent witnessed. Well, I can definitely vouch for that being the case in the office I work in.
They said they had trouble finding senior people. If I had been more aggressive I would have told them "have you considered having an adults table?"
Of course it doesn't. Most of them have no choice.