The message is somewhat accurate though. The grub.cfg hack is the MVP to not regress existing users on grub updates, but it might not always stay that way, and it should not be considered, it's preferable to explicitly configure as the message says.
The message is somewhat accurate though. The grub.cfg hack is the MVP to not regress existing users on grub updates, but it might not always stay that way, and it should not be considered, it's preferable to explicitly configure as the message says.