1-Actually Dropbox lets everyone do just that, I can access the shared folder via the dropbox website whenever I want, download files in there and even access the old or deleted versions..something I see very unlikely in this case for now
Oh I see what you're saying. Bottom line, there needs to be at least 1 copy of each piece available to pull. It also definitely lacks a lot of the features that Dropbox provides on top of file syncing.
Dropbox has servers running all the time.
What they're saying is that this is an important advantage that BT Sync lacks.