I was never arguing against that.
There are plenty of ways to go about achieving a certain outcome that's easier one way than it is another. You see it all the time, especially in powergaming discussions. Take adepts for instance. Most people here will and do tell others to grab a bit of bioware instead of "wasting" their points on Improved Physical Attribute. Ditto for a magician taking Increase Reflexes over Wired Reflexes. That doesn't make those alternative options worthless or overpowered; they're simply options that work better for some concepts than they do others. The monofilament whip is simply an extreme example of that. And, again, this is largely due to the fact that the other melee weapons have shitty stats rather than the monowhip being uberpowerful compared to other options in the game such as firearms or combat spells.
Personally, I always thought melee weapons should have a more static value and a user's Strength should influence armor penetration instead. An average person can pick up a knife and wave it around and be considered a genuine threat, on par to someone waving a pistol around. In Shadowrun, that's simply not the case. Even if they do manage to hit you with it, it's going to be a mild scratch at worse, while the gun remains potentially dangerous. And that's where the real problem lies.