The rise and fall of the "Undercut".
With tyre performance, grip and ultimately lap times dropping off so dramatically during a stint it is now no longer possible - through diligent tyre conservation - to gain track position by pitting later. He who pits first wins!
I'm not a big fan of track position gains made during pitstops but it strikes me that if you can make your tyres last longer there should be some reward. And not as we saw with Lewis losing 5 seconds at the first round of pitstops!
This development doesn't bode at all well for Jenson Button.
The opportunity for Button comes in the final stint. If the others are falling over each other to make their final stop first, they're occasionally going to get it wrong and be left without enough rubber to complete the final laps at a competitive pace. He'll still have to make his move on-track rather than in the pits, but perhaps that won't be as much of a problem as it was in years gone by (particularly if the tyre degradation is a matter of whole seconds rather than tenths).