In a private office you are constantly around people doing the same thing. You have stand ups and meetings with them every day, you pair program when necessary.

In a private office you are constantly around people doing the same thing. You have stand ups and meetings with them every day, you pair program when necessary. And you still have a door so you can focus when necessary without your field of vision constantly full of motion. If you have trouble getting things done in a private office environment either you had bad management that would have been worse in an open floor plan, or you are an edge case no work environment should be catered for.