From what you said, it is not about grub in Manjaro, right?
It’s about how to make Manjaro’s grub entry come out right when another distro’s grub is being updated. I don’t have the technical knowledge about what exactly Manjaro does differently in its handling of intel ucode to make Manjaro so hard to read correctly.
You make a good point about filing a feature request. However, it will be more or less what is stated in my 2nd paragraph above.
Since I don’t know the technical issues behind this, I would welcome further discussion in this thread about this “handling ucode” thing. How come Manjaro does it so differently?