Especially since, you know, bag hits ground, front wheel unweights, you go down like a ton of bricks. Same problem with long cranks/low BB on a fixie except this is at the front which is even worse.
It's not the high speed stuff that caught me out with panniers higher up.
Slow moving, navigating some street furniture, along a pavement,going around a stump or a rock etc, did put some scractches on my bags.
And here's the picture of him cornering on that bike with those bags