If you ask for my personal/honest opinion… my money will be on multiple libraries and the flexibility of collections.
That being said… my opinion shouldn’t diminish your perspective/use case. There’s however already an existing suggestion discussing an option to derive collections based on a folder structure (incl. an option to allow multiple levels of nested collections). If that’s the primary purpose of your suggestion, I’ll encourage you to consider commenting/voting in those threads in order to help us avoid distracting or cannibalizing votes.
Note to self… those two might actually be considered overlapping / redundant as well.
