Race car drivers might disagree. What, are they living in a different world? For that matter, cutting rope is meant to be a test of the knife's ability to cut something tough and fibrous. Maybe folks like crom only play with their EDC's in front of their computer, but there are folks out there who need their knives to perform at a variety of different things. Maybe they need to be able to cut roots or vines, or maybe they're in a job where, amazingly enough, they actually encounter rope. Or that plastic stuff that gets wrapped around packages or pallets. Sometimes, you actually have to cut it, as shocking as that might sound. Believe it or not, cutting rope and cardboard CAN be the daily task of a knife. I'm sure there have to be a few people who have worked warehouse jobs, and wanted something better or otherwise more interesting than the box cutters they usually give you. And even if they're not, they're still good tests as to how well your knife will hold up.
I can't help but think that people who put down cutting rope and cardboard as being "unrealistic" don't really use their knives for much.
And when you really want your knife to be sharp, it's pretty nice if it actually is, and it's not dull because it's a lower quality steel that you have been too lazy to get around to sharpening. Say, when you've accidentally driven off a bridge into water, and you need to cut your seatbelt because it refuses to unfasten. Or when you're out sailing and you've gotten a line wrapped around yourself, and you need to get free.