The issue with the speed, as far as I can work out, is that they've only got partial control over the fringes that they use to push the boundaries.
Those fringes are racing off into the distance as far and as fast as they can; past a certain point, you've got to be lead by them or commit to pulling them up short - but they can't pull them up short because so much of their support tacitly accepts what those fringes are up to.
The issue with the speed, as far as I can work out, is that they've only got partial control over the fringes that they use to push the boundaries.
Those fringes are racing off into the distance as far and as fast as they can; past a certain point, you've got to be lead by them or commit to pulling them up short - but they can't pull them up short because so much of their support tacitly accepts what those fringes are up to.