Earlier quoted context omitted.
Then you've never actually Pair Programmed. It's not "someone looking over your shoulder", it's literally two people writing the code together, one person at the keyboard and the other person saying what's next. Two brains working in tandem on the same problem space. It works really well , but it is exhausting, and difficult to sell.
I've never pair programmed. How can one achieve concentration for "deep focus" or "deep thought"? I'm only able to do that alone. Is it a me problem, or are some people able to focus deeply with others talking to them? There have been (extensive) discussions on this topic here [1]. I don't seem to be alone in the inability to think clearly with interruptions. [1] https://news.ycombinator.com/item?id=22059601
this takes time to learn of course. and individuals handle this differently. i to can't handle interruptions, but when i am focusing a piece of code, and my partner telling me or asking me something about that same piece of code, then for me that's not an interruption. interruptions are notifications and being asked to change the focus on something different. that should not happen when pair programming.
another aspect not mentioned yet, when there is an actual interruption from the outside, one of the people in the pair can handle that interruption, while the other continues to focus. the interrupted one can then jump back in much faster than you would if you were interrupted while alone.