Do they? I constantly see DropBox taking days to sync files that are 30kb on size. Or doing dumbfounding things like download all files, then re-upload all files when I set sync to "online only" on a folder if just one of the files is not set to online only.

Maybe they have grand academic visions and papers, but I've been using them for well over a decade and I feel the client quality has gone downhill over the past few years. They keep adding unnecessary stuff like a redundant file browser while the core service suffers.