whats the point of having a dynamically changing line if every server has the exact same one?

This all sounds great - even more reason to shout at drifters for messing up the racing line, even after they've left!

...was partly my point a few posts ago.

Established racing circuits, especially ones used as much as the LFS tracks don't really have a dynamic line, as it doesn't really get the chance to fade away.

Ok, on a long endurance race cars may lay down more rubber than there usually is on average, but they certainly don't pick it up and move it - the existing 'average' rubber line is still pretty much always there.