No, not all the way 
I’m looking for a greater semantic difference between the core content and metadata (comments (but not necessarily the current implementation), annotations). It’s not a matter of ownership (cards created by me vs others), but of intent and purpose.
In this use case, I see the Kinopio space as a work. It could be a presentation, a mind map, a visual essay, poetry, a moodboard, etc. This could have been created solo or collaboratively, but regardless, we have this core content.
I’d like to publish/share that work with the world and invite comments, discussion, feedback. It should be unambiguous what the core content is versus what are the metadata. Maybe that means the ability to hide comments. In some cases, I want them completely invisible so it doesn’t distract from the original form (for example, my presentation space. I might want to use that space again to present, but now there are comments on it that I can’t hide, I can only delete them, or make a copy of the space etc).
I hesitate to make analogies with other apps because I’m not saying to solve it that way, but it’s a similar idea as comments on a Google doc. They’re on the side and I can hide them. Also, same with Figma. A designer might create some designs in Figma and invite others to add comments and feedback. But that metadata is clearly not part of the work they have done.
(I realize this topic has diverged from the original, but it is all kinda related)