Disabling dashboard on client sites

OK, just signed-up, installed the dashboard on a dev site I noodle around with. And the first thing that struck me is... when I turn over control to a client - how to I "hide" the dashboard and all it's info? I mean, when the site is turned over to the client - they become the admin - so wouldn't they be able to see the dashboard and all its associated information? Or am I missing something?

The only discussion I found on this was from 2012. Has a better solution been found. One that would still permit automatic updates to wpmudev themes and plug-ins but that would disallow access to the dashboard completely?