Dropbox is unusable (and I mean it) as the number of file increases (I have more than 2 million files). What is the use of 1T tier when you cann't really use it (syncing takes forever for a simple additional file, the selective sync seems broken, etc.). It seems this issue has been around for a long time reading the issues. When are you going to fix this? I assume this is a fundemantal issue that Dropbox is unable to solve given their software architecture. I wish I knew this limitation. I am writing this for others to know as well.