I think "best solutions come from new people" is an over-simplification of what actually happens. New people force you to re-examine your assumptions and blind

I think "best solutions come from new people" is an over-simplification of what actually happens. New people force you to re-examine your assumptions and blind spots. Sometimes this is useful, sometimes it isn't. This doesn't mean that new people solve more problems, but sometimes an influx of new people can help the experts to solve more problems because they realise something they assumed to be true/OK wasn't.