The environment is shared for a consistency, if I'm sshing into the environment to do my work then that means I need the environment updated with my config and that either means that we need to share configs on the vagrant user or setup the environment to provision settings for every user of that environment which sounds unmaintainable. It's easier to just work locally through the share directory.
Use can easily do something like this for one-off edits "vim scp://remoteuser@server.tld//path/to/document" or use netrw for a more robust solution to using your local vim to edit remotly. http://www.drchip.org/astronaut/vim/index.html#NETRW
