I don't understand what the guy you are replying to meant in terms of not knowing what was going on in the open space (who cares? isn't that the point of being in the closed office), but I still would say that there are issues with the originally described office.
In my experience, places with "open space where there are closed offices if you need them" have like maybe one or two closed offices and if you used one all the time you'd be the "loner who bogarts the office space".
For an office to truly be both open and closed you need enough closed offices for some people to be assigned a full-time closed office if they choose that. Otherwise you have a situation like those jobs that have unlimited vacation time except you can't ever really use it or you risk being ostracized.
In my experience, places with "open space where there are closed offices if you need them" have like maybe one or two closed offices and if you used one all the time you'd be the "loner who bogarts the office space".
For an office to truly be both open and closed you need enough closed offices for some people to be assigned a full-time closed office if they choose that. Otherwise you have a situation like those jobs that have unlimited vacation time except you can't ever really use it or you risk being ostracized.