It's explained in: https://bugzilla.gnome.org/show_bug.cgi?id=660044 In 3.8 we still need it autostarted to prevent that broadband regression with PIN handling. Also, the double password dialog bug was fixed anyway
Looks like it's still the case with 3.10, but upstream is ok with that regression: https://bugzilla.gnome.org/show_bug.cgi?id=660044#c17 I guess we can simply add a note to Troubleshooting section in the upgrade guide
Note added