I'm not sure I'd go so far as to say that they're the same thing because that might give the impression that architectural activities and development activities were the same or required the same skills.
There are people who can undertake all these activities, others who are only suited to one type and others suited to none.
My worry is a team that becomes an XP steamroller and ends up thinking that everything is merely an extension of development because "it all ends up as code". This is clearly not the case, and I only have to look around at all the people crucial to my team who aren't developers to see it.
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