We discussed this internally and will implement the feature in a way that security warnings will be on by default but other update notifications will be switched off. You will also be able to hide the warnings entirely.
I think this solution should make everyone happy as it doesn’t force you into one particular direction, but it will also help to promote important security updates.
BTW again: this is not an auto-update feature like in Wordpress. It will only be visible in the settings view when there are updates available.
We would also appreciate it if anonymous users could claim their accounts. We will stop showing and accepting anonymous comments and votes in the near future for the sake of quality in this platform.