Well it kinda means approaches that used external scripts (e.g. SSH, telnet, etc.) can’t work anymore…so if that what someone was doing…that likely have to change as a result of this change.
BUT netinstall is likely better approach anyway. You kinda want to control the version deployed, and not rely on the version shipped by factory (which changes depending on when ordered). And netinstall is much easy now that are non-Windows options for it.
There is another thread where netinstall+random default this is discussed:
http://forum.mikrotik.com/t/routers-coming-with-default-passwords/165186/1
I personally have used the branding kit with a replacement for the default-configuration file. So the random default are pretty manageable since I can add our own account to the config in the default configuration and remove the admin one. See:
http://forum.mikrotik.com/t/default-configuration/165596/1