Secondly reading about this it appears shift points and the control gubbins work at least partly on road speed. Now we're all familiar with the BW35 changing up at bad moments simply by backing off, so I assume this is done purely on internal pressures in the old box. Being speed related would of course be a big advantage in day to day driving doing something as simple as approaching a corner and you not having to dive onto the brakes when you back-off? That'd be worth having.
Just about all automatics including the modern ones suffer this to some extent. My mate has a 2011 range rover sport 5.0 supercharged that does exactly this, then overreacts and changes down too far.
I tend to knock the box into 2nd on the bw coming towards a roundabout as you get engine braking and acceleration in 2nd.