I'm unclear on how we use these two tags.
I think we could potentially get rid of the engraving tag and only use notation, but I also wonder if some questions really do deserve the engraving tag.
The closest question I've found that may deserve the engraving tag is Is there a standard source for music engraving? But even then, I don't think we as a community lose anything if this question's engraving tag were to disappear and instead only had the notation tag.
What do we think? Should we do away with the engraving tag and make it a synonym that points to notation? Or are there clear instances where we would need the two separate tags?