Its an interesting phenomena but I think though there is a big difference between a narrow focus, as in a game ie intense concentration on one thing and being able to react appropriately and quickly to an unexpected event outside that narrow focus. When hypo, I want to think of one thing only, its harder to react to others and to 'outside' events.
It's one thing if you're in a safe environment and you're glucose levels aren't plummeting fast (and of cause they might be ) but quite often ignoring whats going on outside your narrow focus could lead to a dangerous situation. I think that that probably applies to almost all everyday activities.