I was just alerted that one of my sites updated. I understand I can disable this but, frankly, I'm alarmed that this feature was implemented.
I do not allow any software to update automatically in my home office. I maintain the websites of many clients and I always perform a backup before updating their sites so I have a recovery path if a plugin fails or something else.
Thanks to this new "feature" I now have a lot of unplanned work to do because I have to modify the wp-config file to disallow this function for every site that I maintain.
I understand that old code is high risk, and I have educated my clients to understand this too. But the fact of the matter is that there have been WP upgrades which have NOT gone smoothly and I've been very glad that I waited a couple of weeks for the bugs to be worked out.
This, in my professional opinion, is NOT a good idea ... not at all a good idea.
I take responsibility for not reading through the 3.8 release notes and taking action then to stop this intrusive functionality.