Connections entries are not WordPress users and have no relation to users unless Link is used to link a user to an entry. So, the CSV Import does not create users, it create entries in the directory. If you need to create users via a CSV upload, there are several plugins available that perform that function. With that said, If “Joe User” has a entry, he would have to register to be a user of the site and if Link is installed and active he will be linked to “his” entry upon login. A user registration and management system will not be built in to Connections for the purpose of editing entries because WordPress already has a very robust system in place.
I hope that helps.