It's absurd to expect human beings, especially software engineers--who tend to be quieter, more introverted, and loner-types--to be herded like cattle into a crowded, noisy open-plan office and expect them to have the razor-sharp focus needed for high quality software development.
If you only hire people who thrive in noisy / distracting environments, I won't be surprised if you end up hiring the wrong people for actually getting the job done-because often times, the people who take on the most work, resolve the most difficult problems, and carry the most weight are those people who can't stand working in a place like that.
And you might want to Google "flow state" and how that applies to development work.
Back in the 80's I was the core programmer on a map-reduce system that formed a part of one of the only 3 products British telecom sold internationally my CTO was one of Vint Cerfs reports.
what have you shipped or done?