As much as I agree with you, your examples prove how little "regular" users consider this. With technologies that are historically user-unfriendly, such as emai

As much as I agree with you, your examples prove how little "regular" users consider this. With technologies that are historically user-unfriendly, such as email, individuals may be aware of the importance of separating work and personal, especially because email is such an 'old' technology. But, for something new, like cloud storage, and for a company like Dropbox, that prides itself in "just working," this is a critical feature oversight.