I will chime in with, if a person can't swim 200 yards without gear, that person probably shouldn't dive.
Having lost my right leg below the knee, I understand limitations suck. It isn't fun not to be able to do something you want to do. Fortunately, I don't have a problem swimming.
To me, regardless of technology, swimming remains a key component of diving. It's all well and good to say that technology has made up for those deficits, but it is harder to swim at the surface geared up (even if you can just float with a safety sausage and wait for the boat) than it is to swim at the surface without your gear.
The requirement isn't there because you need to freestyle 200 yards on a regular basis, but because if things go wrong, you may need to. And, it may be the difference between life or death.