The origin of plug-ins running on the QC happened at TGP when someone asked Doug if the QC would be able to run them, he replied back "Sure, that shouldn't be a problem" or something extremely similar and poof, a star is born.
That sounds like just a comment about the difficulty of it. The faq comment only said they would add plugin support in the future. I’d be disappointed too if I bought a QC based on the hope they would add plugin support. They sure seem to be slow rolling out new features. But considering all the outcry, I was expecting it would be easy to find a link from 2021 to a broken promise they made of a date for plugin support, but I couldn’t find one.