The RYR guys did not divert from minima. Yet they found themselves with 30 minutes at touchdown because you simply don't fly a straight line from diversion point to threshold. Again, no go around allowed at alternate. Plus, you don't always have the chance to divert from a point 200 miles ahead of your destination. Many times it will occur after a 20 minutes holding and once everybody has already started rushing to the alternate.
Anyway, we can discuss all that for weeks, the bottom line is captains and first officers should never feel pressure to bring less than what they feel comfortable with. For some it will be 100 kilos, for other it may be 700. We're not all made equal in the face of stress and pressure. The 700 guy may not be the black sheep. He's only different and is aware of his own lower limits.
Now, past 1000 kilos as a standard magic number is way out normality to me !