I would say that this kind of explanation could be used to justify every wrong statement. In the end if someone claims something it is usually true until someo

I would say that this kind of explanation could be used to justify every wrong statement. In the end if someone claims something it is usually true until someone proves it wrong. I think that in this case Dropbox popularity has proven Joel's statement wrong. And this is also why Drobox is successful. It hid the complexity and provided some simple and intuitive mechanism for file synchronisation. Joel's argument was simply based on the previous unsuccessful attempts...