A point on 3. Some devs know what they are doing and prefer working alone in a quiet area. A lot of other devs have no idea what they are doing and disparage any situation where people aren't practically sharing seats and doing each other's work. Why? because they want other people around them to answer their questions, to do their work, and solve their problems. They are not "feeding" off interaction. They simply don't know the job. Do surgeons only work in groups because surgery is such as social experience that they feed off the social energy which lets them really bro down and do some surgery? No.

The people who typically put offices together usually don't come from an academic background and they typically don't do anything by themselves. Ever. They go from meeting to meeting all day. They have no basis for understanding that some jobs require individual effort. They buy group B's pitch by default. So they make some really bad mistakes:

Open floor plan - great for people who need to ask a lot of questions. bad for people who know the answers and will get interrupted.

Face to Face seating - great for people who want to get other people's attention. bad for people who want to concentrate on hard problems.