That's one way people use Onyx! Specifically, the Projects feature (see the left sidebar) works similarly e.g. you can upload arbitrary numbers of files - going well beyond the context limit of your model - and then ask questions of them.
Maybe some point in time this was true, but not recently. There is a heavy focus on attaching labels to individuals, putting them in one camp or another. This kind of culture is hardly present or not as strong outside of US.