I'm not sure if the drywall helps sound proof the unit, but I hear more muffled sounds from units beside me than above me. As for hardwood floors, it depends on the thickness of the under lay under the hardwood. When I went to the home depot tutorial for hardwood floor installation, they said if you use a thicker underlayment, it will muffle sounds. Of course, the builder probably won't use thicker underlayment probably since it will increase costs. I'm just saying having hardwood floors doesn't necessarily mean it worsens soundproofing.
And regarding the Matrix building, the sound proofing isn't their fault if it's above. The older buildings don't have hardwood floors. They are carpeted. The owners probably removed the carpet and added in hardwood floors but didn't sound proof it with a good underlayment. That isn't the builder's fault if that's the case. I know West One, a newer building than Matrix was only given carpet throughout except the foyer, kitchen and washroom. A lot of the owners ripped out the carpet and put in hardwood floors themselves. If a newer building than Matrix was given carpet, I doubt Matrix was offered hardwood.
Also to make another note. There were some issues with the hose at West One because the plastic part was wearing out with use which caused leaks. But as noted with the inspector, it wasn't because the hoses they used were cheap. It just wasn't designed well but it was a standard used at that period. The same thing could be said about the glass falling off buildings. It wasn't because the glass was cheap. It was because the glass had a defect which caused it to explode. If that is the problem that if things break, the builder is bad. That mean all builders in Toronto are bad because there are different issues in different buildings. At least glass hasn't fallen off the newer buildings yet in the concord buildings. Only the older ones fell (probably due to aging. Some glass age better than others).