I’ve had my pants get caught in the chain and rip exactly once, but it was scary enough that I cuff every time that I wear non-biker pants on a naked-chained bike. Plus, they were the pants to my favorite suit, and they were beyond repair. And I had to show up to a meeting like that. Like I said, last time I chanced it.
I find the fold-and-cuff method to be more reliable than any ankle strap, though sometimes I’ll throw an ankle strap over a fold-and-cuff if I can find one…