> 1. The use of drive letters A-Z for file system access.
Why is this a problem? As a user, I've always preferred to have drive letters - it makes it immediately clear if, for example, I'm moving files between different physical drives.
Considering mount points, reparse points, and things like subst, I doubt you can ever really know that. Granted, the deviations from the normal scheme are your own making as a user, but so are the places where you mount volumes from different physical drives in a single root hierarchy.
