I know some will say, do the viewers really care, does it matter... but that's not really the point. It works perfectly fine for the weekend lunchtime summaries when the News channel presenter does those.
I think I'm right in saying the weekend evening bulletins on BBC1 come under the remit of the editor of the weekday 6/10, and not the NC? So separate editorial teams behind the scenes, unlike at lunchtime, which may make the duty NC presenter doing the network lunchtime a bit easier?
I guess as well the BBC don't want to be seen as 'downgrading' their weekend evening BBC1 bulletins by integrating them into the NC output. (Personally I think the weekend bulletins, especially on a Saturday, are too short and should be extended, which would make the current set up more justifiable. On a busy news Saturday, which does happen fairly often, 10-15 minutes is insufficient, and there will almost always be plenty of sports news to fill up time on a quiet news Saturday. Sundays are usually slightly longer, so not quite such an issue)
Be interesting to see whether Sophie Raworth does it next time she presents the One.
She has done the NC before, about 10 years ago did a few Monday afternoons with Jon Sopel after doing the One