Was just checking that video, and something immediately caught my eye.
In the comparisons you can hear, and Rabea even points out himself, that plugins sound slightly different in the QC. That's not so much interesting as the reason why: turns out that, in order to make plugins work in the QC, they have to redo them from the ground up. NDSP's Director of Artist Relations points out that this is particularly a problem with older plugins, as their modeling techniques have evolved over the years.
So... yeah. Dunno, it feels weird to say that the QC can "run your plugins" when they have to be, quite literally, new models to work in the box.