Hey Ben! Thanks for the feedback. This is definitely something that we’ve considered (and continue to consider) extensively. For these recent updates to collections that allow them to contain other collections, we wanted to keep the behavior consistent with the way that collections previously handled notebooks (in that notebooks don’t inherently belong to any one collection but can be listed in many) to avoid potentially confusingly blurring the lines between our collections feature and a more traditional notebook structure. Another way we hope to extend collections in the future is to allow users to save other users’ content to their own collections, which fits in easily with our current non-hierarchical approach.
That said, we know that in some cases hierarchy can be extremely useful in organization for obvious reasons and collections as they are today simply do not allow you to achieve this – making this experience better is certainly something we plan to address soon. In addition to offering a more traditional folder structure, some other ideas we’ve thrown around are allowing users to pin particular collections or curate their profile so that certain content can be promoted as entry points. I can’t say exactly what the change will be, but these options are all on the table and we’re definitely planning to make some improvements on this front in the coming months.