You make a good point. We've gone to great lengths to ensure this doesn't happen. One of those lengths is that you can export your entire library to Dropbox. This protects you against us failing or being stupid in other ways.
You're right. That is bad. We added Dropbox support before Dropbox allowed per-directory sandboxing. We're on it (but we also have a huge number of things to do). This does have a fairly high priority.
You make a good point. We've gone to great lengths to ensure this doesn't happen. One of those lengths is that you can export your entire library to Dropbox. This protects you against us failing or being stupid in other ways.
S